Pipes and Cisterns - Shortcuts & Tricks for Placement Tests, Job Interviews & Exams
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- Опубликовано: 6 фев 2025
- Crack the quantitative aptitude section of Placement Test or Job Interview at any company with shortcuts & tricks on Pipes and Cisterns. Extremely helpful to crack entrance exams like MBA, Banking - IBPS, SBI, UPSC, SSC, Railways etc.
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Practice Questions on "Pipes and Cisterns" available at: www.careerride.com/mcq/pipes-and-cistern-quantitative-aptitude-mcq-questions-21.aspx
please make a video on geometry
Can you plz check Q no 6 again? It seems logically flawed. Though its quite okay with mathematical equation I found it problematic in real life scenario. The tank would be filled at 9:19am. So If you wait to open the Valve R at 10 am the tank will overflow.
@@jolKOBI Agree! From 10 it will be full and then on R will empty it and p,q will oppose it. If calculated by the method given in the video, tank need extra storage.
Sir can you please do video on calendar problems?
@@jolKOBI right
I find only career ride, feel free to learn and dear Sir give thorough teaching, others are only for already brilliant students, so these are the best tutors who genuinely care about the majority of us students.
Thanks for spreading knowledge,I found other helpful channels too.
Can you pls share names of those channels pls ENGLISH medium@@saitanigam6570
"Simply invert" is the only thing that's keeping me alive
And 1hr rule😌
Me too
😁
Yeah
Sir, your channel is one of the most user-friendly. The communication in the videos is very simple. I like watching videos at 1.75X and 2X speed. However, the information is excellent.
This lecture is completely mind blowing... I am telling u guys... I have never seen anybody like this sir who explains everything in detail....!!
Thanks for the kind words, Chakrababu! Do share the video with your friends and family , if you have found it helpful. Stay connected :)
That too different kinds of problems
@Daredevil your answer is 33/4 minutes. Is it so?
Carrer ride channel I am greatly thankful to students free of cost clarity concepts explaining thanking you so much .
My mother told me , at night I was shouting ..."Simplyyyyyy Invert"
😂🔥
😂😂
@sanjureddy pallae 🤣🤣🤣🤣🤣🤣🤣🤣
Bro.... You diiiiiid great..😂😂
He sometimes get annoying 🤣🤣
31:30 6th question..Tank's capacity is fixed..till 10 am,it has been overflowing..so to empty the tank we have to consider only that fixed capacity of the tank..
I am doing it in a different way..efficiency method..in which i got tank capacity as 6 units..but till 10 am tank got filled my 11 units which means it was overflowing so when R is opened at 10 am,we dont need to consider the overflow,just tank capacity only..
ie 6/combined efficiency = 1 hr 12 minutes
And answer is 11:12 am
All they do is maths... thanks for the validation.
even i was about to comment this
even akshay kumar sinha was telling that.
There is a *very important and SCARY lesson* to be learnt with Q6 at 26:10
and the lesson is that *never use formula without understanding the complete logic behind it AND common sense and logic always prevails over formulae*
because the formula used has been applied correctly but the answer is completely flawed , and thus this is what happens when students use formulae over common sense and logic
The correct answer is 11:12AM and NOT 12:12 PM ( the working is pointed out in the other comments here , but i just wanted to bring to light the utmost importance of common sense and logic with respect to formula )
but discarding this, yet another excellent video to learn about aptitude !
In the 6th problem, at 8 am tap P is opened(2 hrs before all three are open together) and needs 1.5 hrs to fill the tank(ie. P alone can fill the tank in 1.5hrs + half hour water is wasted). At 9 am tap Q is opened(1 hr before all three are opened together) and needs 2 hrs to fill the tank but since P can alone fill the tank, lets consider all the water of tap Q is wasted.
Now at 10 am tap R is opened( needs 1/2 hrs to empty the tank).
At 10am the tank is full and all 3 taps are open together.
Total work done by all 3 taps is 2/3 + 1/2 - 2 = -5/6. So when all 3 are open together they will empty a filled tank in -6/5 hrs ie. 1.2 hrs(1hr and 12mins).
Therefore, the tank will be empty at 11:12 am.
My point exactly
Smart!!
So we don't need to check the sign right? I got this negative ans and thought there was another way to solve it
So, which one is right?
@@awakeninghumanity6852 i find your yt channel description interesting, would like to discuss?!
Very nice set of questions...exactly what is required for cat. Thanks thanks a lot for providing a material with great solutions. Please keep posting more and more such videos.
The simplyyy invert is even more funny at x2 speed 😂
Good explaination sir. Thank you
Exactly
Thank you for patiently and thoroughly explaining these maths concepts. Hoping this will help save me 😭...More power to your channel💪🙏
When you say it's very very easy we will confident enough to solve that problem tq sir 🙏👏👏
In Q.6 ,If the tap P is opened at 8am,it will fill 2/3 amount of tank. Now at 9am,Q is also opened. now upto 10am the total tank filled is 11/6, which in Practical life states that the tank is overflowing. But now at 10am , R is opened which empties the tank in 1/2 hour. so isn't it right that the tank empties in 2:30 hours that is at 10:30am.
Although, I understand that this is just an example that you have drawn to make the concept clear in these type of problems. For different numerical value it must have also covered the practical problem.
But if such question is asked then what is advisable either to go with mathematics only or to keep in account for the practical overflow and stuff.
Btw I love your Teaching style.
i tried to do it in my way..iam not getting answer..which he got 4 hour 12 minutes here....
Sir ki teaching is SIMPILY GOOD!
At 29:51
I think the solution ignore the total capacity of the tank.
P can "fill" the tank in 1.5 hours and it was opened for 2 hours (8 to 10)
I think the question is then rearranged to "How much time it will take to empty the full (overflowed)) tank while P and Q filling it after 10 am".
i.e.,
=1/(1/2) -1/1.5 -1/2
=2-(7/6)
=5/6 th part
=6/5 hour = 1.2 hour
but, I am getting 11:12 am and not 12:12 am.
EXACTLYYY, even im getting this EXACTTT solution as you. ie. even im getting that, the tank gets emptied at 11:12 am , and not at 12:12 pm
reading this ,,, i am geting a feeling of releif that "i am not alone" . thanks bro
For the 9th problem P and Q can fill the tank in 6 hours
And R empty in 30 hours for 2 hours it's work done is 1/15
So P and Q have to fill this 1/15th work
So (6/15) *60mins
Ans 24mins
This is what I was also confused about...sir has nt considered the lcm of 3 and 2 that is 6 during problem solving
Just an advice from me to everyone asking for shortcuts.... There are no shortcuts you just need to practice them than only you will get it..... You guyz asking everything in shortcuts there is no such thing in classes to they do same way.... So just practice them
Yesterday i watched your time and work video today watching this only from single video I'm doing almost all sums you're such a great teacher
3 sum solve by using another simple method also bro
Formula =XY/Y-X hrs
24×36/24-36=864/12=72
Shut up😂
The concepts that u r teaching is so good, I thank you for sharing the indepth concept clarification
Thanks a lot 🙏Your videos are very helpful.
Just one suggestion that please try to tell shortcuts to solve these questions for competitive exams.
E.g. In the last question,we can directly find the amount of time required more.
In 2 hours, pipe R emptied 2*1/30 part of the tank that is 1/15th part of tank.
So P and Q in one hour can fill 5/30=1/6th part of tank.So just find time required for both of them to fill 1/15th part of tank.
1hr 1/6
? hr 1/15
Cross multiplying you get 6/15 hr = 6×60/15 min =24 min
Sir in ur quantitative section please add logarithm problem section also
Explaination of all topics by u is amazing
Thank u sir🙏
Very well explained !
The way of teaching is so so good that it helps me to solve more and more difficult ques very easily.Your concepts are so good.whenever I have to do any question from any topic,I refer to your video first,it just also give people a great revision from your videos. Thank you so much for giving us those videos on quantitive aptitude.Make more and more videos on logical reasoning also.God bless you sir !
Best channel for learning aptitude ❤️
sir in question no.-7 tap Q's time you have found to be equal to 18 hrs, now by that value if we try to find the time taken by P tap then it will come out to be 36 hrs according to your equation which is not possible since the tap P can fill at twice the rate as tap Q. In my view the equation should be Q=2P and not P=2Q. sir think about it...............then the answer will change
Yeah, it should be Q=2p
Exactly. That's what I was looking for. No worries. Just a mistake.
NO coz it's a rate and not directly time
The way teach sir just awesome....
Sir you are really superb ❤❤
You explains each nd every concepts so clear 😍😍
Thank you so much❤❤❤❤
Ur explaination is very easy to understand dull students also pass the exams
Thanks for your feedback, Chethan! Stay connected :)
Excellent Teaching Style
QUESTION no. 6 , solution is wrong(tank will be overflown by 10 pm u have to exclude it ) , it is very sad ,that no one noticed it yet
you have put lots of efforts ,sir , and I'm very grateful for that, but please correct that mistake
Receive my Love and Respect brother ❤️
Simplyyyyyyyyyyyyyyyyy...
Great explanation sir
Thanks, Praphul! Please subscribe for more career related videos and stay connected :)
Iam preparing for Infosys,tcs placement exams. for apptitude round this video was Helped me a lot.
Sir......no words 👍👌
Ur explanation .... Super sir...really I addicted to ur teaching...sir
Conceptually Explained.....Thanks a lot Sir.....
Sir, due to your easy explanatiin i got placed in fendhal☺☺ thank you soo much sir
That's such a great news, Sayali. Thank you for coming back to share it with us. All the best!
Awesome... Full concept covered flawlessly
Thanks, Rashmi. We have got some interesting videos on Logical Reasoning, Resume Writing, HR Interview and Interview Q & A on core topics as well. Do take a look. :)
So nice of you sir 🙏🤗🤗🙏 thank you so much for your support
I think Q6 is incorrect, hear out my explanation.
If P,Q & R work together, then they will take exactly 1.2 hours to empty the tank(here it's virtually impossible to explain how I got to this 1.2 hours).
Next, tap P opened at 8:00, tap Q at 9:00 and tap R at 10:00 therefore after 2 hours, all the three started working together which means that exactly at 11:12(10:00 + 1.2 hrs) the tank will be empty.
Correct me if I am wrong here, but as per me this is the correct answer.
U changed my perception of CSat is tough to I can solve by ease(With technic)..
Thank you ❤️
Really good illustration
shortcut for 6th question is
(1/1.5)*1+((1/1.5)+(1/2))*1+((1/1.5)+(1/2)-(1/.5))*t=0
Thank you for easy concept of pipes and cistern
awe some training, clear, clarity , just shotting an arrow
Thanks for the kind words, Surekha. Do share the video with your friends and family & join us in our mission to make good content available to all. Stay connected :)
Nice explanation sir....but in question 6 at10am the tank will be overflowing so at 10a.m the condition is that we have opened all the three taps and the tank is filled up so the answer is 11:12 am
I also felt at 10:00am tank will be over flowing-
so actually combined rate will come to force at 10am
2/3+1/2-2/1= (7-12)/6= -5/6
50 mins from 10:00am that is at 10:50am.
yes u r write...i also felt that same
U r the best teacher in explaining the things. Loved the way u explain the concepts and i understood all the concepts very clearly. Hats off to you sir. Keep it up!😊😇
Simply Invert..😅😀😀😊
Well..
Thank you Sir.
😀
Thank u very much sir.
Just because of u I think that this topic is easy😇
You're welcome, Meena. Glad that you found the content useful. Do take a look at our other videos too :)
Your explanation is very easy to understand. Thank you...
amazing way of teaching sir
Q.9 p&q take n time to fill & R opened for 2 hour put on eqn n(1/15*1/10)-2/30=1 get n=6.4h if R is not open eqn (1/15*1/10) P&q take 6h waste of time =0.6 h =24 min
Waste of time=0.4 h =24 minutes
Very well explained!
21:50 There both pipes are opened initially so (1/22.5) + (1/15)
For problem4:
In 1min, m can fill: 1/22.5
in 1min, N can fill 1/15
Let N run for x mins.
Hence it will fill: x/15
M should run for 18mins
Hence it will fill, 18/22.5
Hence 18/22.5 + x/22.5 = 1 because entire tank is filled.
Hence x = 3.
x/ 15 not x/22.5
I have subscribed ur channel from my all of 3 id
Good explanation Sir. Thank you for uploading such lecture.
For ques 5, there is a formula
nt/n^2-1. Where n=5, t=32.
Tq
No
Thank you sooo much sir this is the first video i am seeing from ur channel after half the video i was able to solve the remaning ques of yours easilly by pausing Though i made minute mistakes i feel like i have understood the concept very well. Now i am going to watch your other videos. Thank you once again sir.
It has been 7 years… but it is still relevant😮😮
All our videos are based on concepts, Tanisha. And, the concepts of a chapter do not change, be it any year or exam. So, they'll always be relevant. :)
sir i like yr vidio every youtuber is confusing by making 2-3 question in one vidio by part 1 part-2 like that but you complete one chapter in one vidio its makes student easy to understand.....very nic sir its help me lot..i will watch yr all vidio for my exam because yr full vidio is nt making me confuse....subscribed yr channel
Thanks for your feedbac, Shivam! All the best. :)
Thank you so much sir for all tricks and shortcuts.... 😊
Thank you so much
Very good explanation.Easy to understand
OMG thankyou very much such a very informative video thank you sir,I was literally unable to solve any from this chapter but your video clears my concept and also how to solve it's questions to the toughest level
question 6 is in correct. bcz at 8 am if pipe p is on and 9 am pipe q is on then tank will flow.
Love yu boss😍😍
Thank you I think we can shall may vphv understand the importance truth and value of pipes to carry water and the stresses they undergo and use natural materials like bamboo rosewood etc., for making them at any cost that prevent conduction widening and narrowing that result in repairs........................
Thank you so much sir for this very helpful lectures.
Sir very nicely explained... thanks a lot for such videos but i have doubt in one Question:
In Q6, they haven't mentioned that pipe A is closed when pipe B started, so does that didn't mean that after 1 hours both A and B is open...
Please consider my doubt and reply 🙏
best teacher!!!!!!
In question no.6 the tank is overflowing at 10am. Problem solve karthe-karthe. Reality ka Maa-behen kardiya.
At exactly 10 am the tank is full. So, now r works on emptying the tank while p,q works on filling the tank. Therefore r is positive while p and q are negative.
(1/r)-(1/p)-(1/q) = 1/(time taken to empty the tank).
(1/0.5)-(1/1.5)-(1/q)=1/t
solve the above we get t = 1.2 hours which is 1hour 12 mins.
The final ans is it takes 3Hours 12mins to Empty the Tank.
So, the tank in Empty at exactly 11:12 AM.
Exact👍
👍👍
No you are wrong
You are ASSUMING that it will be filled on 10 AM and then tap r is opened
Solve according to the statement
@@nitishkamble2779 exactly , actually by @akshith 's case, the tank is filled well before 10 am ,may be that's why the answer is not correct.
yaaa the ans should be 11 .12 Am.
Fantastic sir
In question No.6 shouldn't the answer be 3hr 12min , because by 10:00 am the tank will be completely filled now the 3 taps are open and then it will only take 1hr 12 min to completely empty the tank. So a total of 3 hr 12min is needed.
right....
The question has been solved in an incorrect way....
thankyou so much for good quality content
I understood well, better than RS Agarwal book
22:16 Q4) I think the Qs is like this..both the pipes M+N r opened and after some time N closed and only M open for last 18min to full the tank...so here after calculating pipe M for 18 min and then we have to find out M+N for 1min and calculate for M+N for 45/22.5 min here..where u can find how much time N closed...
I think u got my doubt....plzzz reply sir
Make 4.5/22.5= 9/45=1/5 so dull student like me can do cal. fast
I question number 6 why did we consider the overflow amount, once the tank is filled
You explain it really well. Thanks for the video. Please upload videos on other topics as well. Thanks in advance.
You're welcome, Akshay. Did you see our Quantitative Aptitude playlist? It carries all the chapters. Hope this helps.
If you have found this video useful, do share it with your friends and family. Stay connected :)
Cat level questions explained effortlessly
Really appreciate the way you teach sir!!!
Perfect Explanation !! Thanks a lot 👍
Thank you ...really well explained 👍
Tq sir I understood this because of u sir. Once again tq sir
sir please use a good mic because sometime your voice echos too much and it becomes hard to get the part ...... overall love your teaching style
U r teaching osm
Great video sir
Units method is much more simple... But only after learning the concept... Ex 3 in video:
A 24
A-B 36
Total work(LCM) =72
A one hr work =3 units... A-B one hr work= 2 units... So, B hr work= 1 unit... So, 72/1 =72 hrs
7) Total work = 30 units
R's one hr work = 6-5 =1 unit
P Q
Work ratio= 2 : 1
Q+R taken time = total work / Q+R one hr work = 30/(5/3 +1) = 45/4
8)
A alone taken time = total wrk/A' one day work = 2.4 / 0.4 = 6
A => 6x100
Some of the comments do not agree on the Answer of 6th.question, but I do agree,I don't think Sir is wrong,, please verify your answer who don't agree
It is wrong
Thank you very much for your service
Very much useful very clear conceepts thank you sir
You're welcome, Matheswari. Please subscribe for more career related videos and stay connected :)
such a great video, can we pls get the name of this excellent teacher pls
Thank you for your efforts
See very easy 😃 simply invert... 🙏
Sir it take more time for solving this type of question? Like question no9
Sir please make videos on calendar problems. The most difficult one's.
As usual please make it easy for us 🙏🙏🙏🙏🙏🙏🙏🙏🙏
Calendar Video: ruclips.net/video/oxc4G14nyUY/видео.html
My doubt is in question 4 when N is closed than we shoud assume {(1/22.5)+(1/15)}x instead of x/15 as question says both open simultaneously and than N closted after some time
Use this formulae 1- ( tnk full / first tank) × second tank let me know if you got it !
Amazing sir. Thank You this helped me alot.
Easy trick coz we jussssst invert
haha!
yaa lool