@26:00 The equation came out to be correct and it SHOULD BE car B that malfunctioned. Since car A travelled for MORE time compared to car B because car B had stopped running for 2 hours. Easier way to understand is ( (4x) *(t) for car A = 600 km and 5(x) *(t-2) for car B = 400 km). Now we can take ratio of both equations and the speed of car B is 175 kmph.
@26:00 Distance / speed = time [Car A] 600/4× = 400/5x + 2 [Car B] 150/x = 80/x +2 150/× - 80/× = 2 70 = 2x x = 35 Therefore, speed of car B is 5x = 175 kmph (Car B malfunctioned as despite having speed 5x it could only cover 400 kms and A having speed 4x covered 600 kms. Cause : Car B malfunctioned and was idle for 2 hours .
In dog question if the dog is travelling total 8km in same direction and for reverse direction we can actually form another GP considering 2 as a first GP with same comon ratio.
in the same question, it say twice the initial speed of R is 2 more than the speed of L, so will we take the initial speed of L or the changed speed L-2 ??
26:25 , the speed ratio is different in both car . So how can you say that both car will reach the meeting point at the same time even if the CAR A is working properly. According to question car A is not working properly which is why it is taking 2 more hours.
@himanshuupadhyay5918 , Point no 1, if two body start at the same time ( let's say at 12 pm) and meet at 12:15 , this simply means that they they travel for same time. In short agar question me bola jaaye ki do body same time pe ek dusre ki taraf move karti hai toh wo same time pe hi milengi ye baat obvious hai, Aapne bola speed different hai, tabhi dono car ne distance alag travel kiya hai.. Point no 2, kuyki time same lagna chahiye but ratio wise time alag aa raha hai aisa isiliye ho raha hai kyuki car A kharab ho gayi thi and 2 hrs ke liye rook gayi thi, that's why maine ratio wise dekha toh jo car A ko extra time lag raha hai wo rukne ki wajah se laga and isi wajah se maine connect kiya.. I hope abhi clear ho gaya doubt
Nope they'll meet at 3.40 cause as he saved 20 mins going to the office, he'll automatically save 20 mins of coming back from the office and hence they'll save total 40 mins. If they meet at 3.30 they would've saved 80 mins in total
Ashok ki speed 4km/h hai. So he takes one hour to reach the river. In one hour, dog can travel 12kms (D = S*t = 12*1). So if 8kms is for same direction, and totally he ran for 12kms, opposite direction is 4kms.
@avnishsingh2000 , dog ne distance 12 travel kiya kyuki man ko river tak jaane me 1 hour lage, I hour isiliye kyuki distance 4 hai and man ki speed bhi 4 hai.. Ab jab aadmi river pe pahuch jaayega dog move karna band kar dega , basically dog 1 hour run karega , dog ki speed hai 12 and wo 1 hour run karega , so that's why dog 12 km run karega
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@26:00 The equation came out to be correct and it SHOULD BE car B that malfunctioned. Since car A travelled for MORE time compared to car B because car B had stopped running for 2 hours. Easier way to understand is ( (4x) *(t) for car A = 600 km and 5(x) *(t-2) for car B = 400 km). Now we can take ratio of both equations and the speed of car B is 175 kmph.
yes bro you are right car B is malfunctioned. My answer is -175 if considering car A as malfunctioned
@26:00
Distance / speed = time
[Car A] 600/4× = 400/5x + 2 [Car B]
150/x = 80/x +2
150/× - 80/× = 2
70 = 2x
x = 35
Therefore, speed of car B is 5x = 175 kmph
(Car B malfunctioned as despite having speed 5x it could only cover 400 kms and A having speed 4x covered 600 kms. Cause : Car B malfunctioned and was idle for 2 hours .
this is exactly what I did, I spent almost half an hour checking what mistake I did, turns out i was right after all, haha thanks man
In dog question if the dog is travelling total 8km in same direction and for reverse direction we can actually form another GP considering 2 as a first GP with same comon ratio.
thankyou sir
Sir kya lokesh , rakesh wale qsn me After meeting point s1/s2 = rt ( t2/ t1 ) use ni kar sakte? where t2=t1 ?
sir at 1:26:45 we have one formula t^2 = t1*t2... and t1=t2 so we can take any 1 time and then solve by this method...its fast
in the same question, it say twice the initial speed of R is 2 more than the speed of L, so will we take the initial speed of L or the changed speed L-2 ??
26:25 , the speed ratio is different in both car . So how can you say that both car will reach the meeting point at the same time even if the CAR A is working properly. According to question car A is not working properly which is why it is taking 2 more hours.
@himanshuupadhyay5918 ,
Point no 1, if two body start at the same time ( let's say at 12 pm) and meet at 12:15 , this simply means that they they travel for same time.
In short agar question me bola jaaye ki do body same time pe ek dusre ki taraf move karti hai toh wo same time pe hi milengi ye baat obvious hai,
Aapne bola speed different hai, tabhi dono car ne distance alag travel kiya hai..
Point no 2, kuyki time same lagna chahiye but ratio wise time alag aa raha hai aisa isiliye ho raha hai kyuki car A kharab ho gayi thi and 2 hrs ke liye rook gayi thi, that's why maine ratio wise dekha toh jo car A ko extra time lag raha hai wo rukne ki wajah se laga and isi wajah se maine connect kiya.. I hope abhi clear ho gaya doubt
@@ramantiwari1205 thankyou so much sir. now it is pretty clear for me. you are one of the best teacher , really appreciated
1:21:20, 6y/(x+2) = 6x/(y-2) = 6, the time will be same, ie 6 hours. no need to solve quadratic
nice
Dog ka question mey apna na 2 aur 8 ko into 2 kya please till me that sir
175km! 2nd ans
in first question they should meet at 3.20 instead of 3.40
Nope they'll meet at 3.40 cause as he saved 20 mins going to the office, he'll automatically save 20 mins of coming back from the office and hence they'll save total 40 mins. If they meet at 3.30 they would've saved 80 mins in total
They would have saved 60 min. In total if met at 3.30
Hello sir
Dog vale question mai
12km kaise aaya samaj nhi aaya
Ashok ki speed 4km/h hai. So he takes one hour to reach the river. In one hour, dog can travel 12kms (D = S*t = 12*1). So if 8kms is for same direction, and totally he ran for 12kms, opposite direction is 4kms.
Sir can you give me the phone no. Of Unacadmey center
sir dog and river wale ques mein total distance 12 kese aya
got the answer
@avnishsingh2000 , dog ne distance 12 travel kiya kyuki man ko river tak jaane me 1 hour lage, I hour isiliye kyuki distance 4 hai and man ki speed bhi 4 hai..
Ab jab aadmi river pe pahuch jaayega dog move karna band kar dega , basically dog 1 hour run karega , dog ki speed hai 12 and wo 1 hour run karega , so that's why dog 12 km run karega