Discussion of Question with ID = 067 under Problems-on-Trains

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Question

A train running at a speed of 19m/s crosses a pole in 18sec. How long will it take to cross a platform of length 684m?

A

54 sec.

B

55 sec.

C

53 sec.

D

56 sec.

Soln.
Ans: a

The length of the train can be obtained from the time it takes to cross the pole. The length of the train = $19 × 18$ = 342m. To cross the platform it must travel a total distance equal to the combined lengths of the train and the platform at this speed. So time = ${342 + 684}/19$ = 54 seconds.


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