What is the speed of train B if train A is moving at 45 km/hr? - ProProfs Discuss
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What is the speed of train B if train A is moving at 45 km/HR?
Two trains A and B, start from stations X and Y towards each other. They take 4 hours 48 minutes and 3 hours 20 minutes to reach Y and X respectively after they meet.



A. 60 kmph
B. 45 kmph
C. 50 kmph
D. 54 kmph
E. None

This question is part of QUICK TEST ON TIME-SPEED-DISTANCE
Asked by Divyanaidu, Last updated: Oct 10, 2019

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1 Answer

divyanaidu

Divyanaidu

Answered on Nov 10, 2017

54 kmph

Let the speed of train A be SA = 45 kmph and that of train B be SB Then, time taken by train A = TA = 4 hours 48 minutes = 4 + 48/60 = 24/5 Time taken by train B = TB = 3 hours 20 minutes = 3 1/3 hours = 10/3 hours Using formula SA/SB = TB/TA 45/SB = 10/3 X 5/24 = 25/36 = 5/6 SB = 45 X 6/5 = 54 kmph.
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