Question
A man is running at a speed of 10 m/sec in the same
direction of the train. Train can cross the man in 6 seconds. If speed of the train is 108 km/hr, then find the time taken by the train to cross a bridge of 90 metres.Solution
Train speed = 108 × (5/18) = 30 m/sec
Relative speed = 30 - 10 = 20 m/sec
L/20 = 6 ⇒ L = 120 metres
Time to cross bridge = (120 + 90)/30 = 210/30 = 7 seconds
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