firstly 2/3 = 1/1.5. I think you got that already. I changed it to 2/3 kilometres per hour, because that is how we usually represent speed, in km/hr or miles/hr. We don't usually say our speed as 1km/1.5 hours. Also, to solve the problem you need the speeds to be in a common ratio, either km per hour or hours per km. Either way the ratios need to be the same. If you keep the speed as 1km/1.5 hours, then you need to change Tim's speed to km/1.5 hours which would then be 0.75km/1.5 hours. You could solve it this way also. There is nothing wrong with that, I just think writing the speed in km/hr makes more sense. Good question though. Maybe you are more used to seeing speed as miles per hour?
It’s the time for them to travel 1km in total. As in Tim might travel 600m and John 400m, so in total they have traveled 1km. You could think of it as if they start 1km apart and walk towards each other, how long would it take for them to meet up.
Great explanation thank you! 💐
All you have to do is multiply the two numbers for the numerator and add them for the denominator (working against you subtract).
Good topic! It's like the christmas cracker riddles
This question is very popular in GRE.
Which level is it ?
why do 2/3 km/hour? i dont get it, wont you do 1km/ 1.5?
firstly 2/3 = 1/1.5. I think you got that already. I changed it to 2/3 kilometres per hour, because that is how we usually represent speed, in km/hr or miles/hr. We don't usually say our speed as 1km/1.5 hours.
Also, to solve the problem you need the speeds to be in a common ratio, either km per hour or hours per km. Either way the ratios need to be the same. If you keep the speed as 1km/1.5 hours, then you need to change Tim's speed to km/1.5 hours which would then be 0.75km/1.5 hours. You could solve it this way also. There is nothing wrong with that, I just think writing the speed in km/hr makes more sense. Good question though. Maybe you are more used to seeing speed as miles per hour?
Thankyou Sooo much
90*120 / 90+120 = 51.43 minutes. No fractions needed
Why do you swap the fraction around to figure out time?
If you have 7/6 t and you want to isolate t, you have to change the subject.
I don't get why you did the second question when it's the same problem and answer except different wording.
I was trying to make a point about how you can think about these types of questions. Maybe it didn’t work 🤷♂️
Make it to eszy
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Yo this comment is fire❤
Wouldnt the answer for the first problem just be 2 hours? Them traveling together isnt going to increase Tim's speed
It’s the time for them to travel 1km in total. As in Tim might travel 600m and John 400m, so in total they have traveled 1km.
You could think of it as if they start 1km apart and walk towards each other, how long would it take for them to meet up.
@@maths.explained Ah, 1km as the total distance traveled of the two. That makes more sense, thank you