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again a very good question for practice

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by sana.noor » Fri Aug 30, 2013 3:42 am
Trains A and B travel at the same constant rate in opposite directions along the same route between Town G and Town H. If, after traveling for 2 hours, Train A passes Train B, how long does it take Train B to travel the entire distance between Town G and Town H?
(1) Train B started traveling between Town G and Town H 1 hour after Train A started traveling between Town H and Town G.

(2) Train B travels at the rate of 150 miles per hour.

OA is A
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Source: — Data Sufficiency |
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by vinay1983 » Fri Aug 30, 2013 5:18 am
Given,

Speed is constant
Distance is same.
Travel:Opposite direction

Time varies if the time of arrival or departure of each train varies or different.

If we have some info about this, maybe we can do something.

Statement 1

Suppose Train A started at 3 p.m, then train B started at 4 p.m

Yes we can do some calculations and find out the time required by train B to travel entire distance between G & H

Statement 2

Only speed is given, but prompt had already mentioned that "Trains A and B travel at the same constant rate", hence no new information is added.

OA A

I hope I am right!
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by sana.noor » Fri Aug 30, 2013 5:27 am
definitely, the answer is A. if the rate is same then they must covert the entire distance at the same time. question says that B started after and hour or train A. after an hour the train B passes train A, we must remember that by that time train A has traveled two hours. as the rate is same...so the two trains will take same hours. train B traveled 3 hours in total to cover he entire distance.
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