Two trains running in opposite directions cross a man standing on the platform in 27 seconds a...........

Quantitative Aptitude ( CCS) Problems on trains

Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is:

1:3

3:2

3:4

None of these

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Explanation:

Let the speeds of the two trains be x m/sec and y m/sec respectively.
Then, length of the first train = 27x metres,
and length of the second train = 17y metres.
(27x + 17y)/(x + y) = 23
27x + 17y = 23x + 23y
4x = 6y
x:y = 3:2