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A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?

A.	40 sec	B.	42 sec
C.	45 sec	D.	48 sec

Answer and Explanation

Answer:40 sec

Explanation:
Formula for converting from km/hr to m/s: X km/hr = X x (5/18) m/s.
Therefore, Speed = 45 x (5/18) m/sec = 25/2 m/sec.
Total distance to be covered = (360 + 140) m = 500 m.
Formula for finding Time = Distance / Speed
Required time = (500 x 2 sec)/25 = 40 sec.

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