Two trains of equal length running in opposite directions pass a pole in 18 and 12 seconds The train...........

Quantitative Aptitude ( CCS) Problems on trains

Two trains of equal length , running in opposite directions , pass a pole in 18 and 12 seconds. The trains will cross each other in

14.4 sec

15.5 sec

18.8 sec

20.2 sec

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Explanation:

Let the length of the train be L metres
Speed of first train = (3600/18)xL m/hour
Speed of secxond train = (3600/12)xL m/hour
When running in opposite directions, relative speed = 200 L + 300 L m/hour
Distance to be covered = L + L = 2L metre
Time taken = (2L/500L)x3600 sec
=14.4 sec