Discussion of Question with ID = 073 under Problems-on-Trains

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Question

A train of length 108 m crosses a bridge at a speed of 40 km/h in 23 seconds. What is the length of the bridge(approx.)?

A

148 meters.

B

256 meters.

C

300 meters.

D

200 meters.

Soln.
Ans: a

In 23 seconds the train covers a distance of 23 × 40 × (5/18) = 256 meters. This distance is the sum of the lengths of the train and the bridge. Subtracting the length of the train we get the length of the bridge = 256 - 108 = meters.


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