Question
A man is running at 5 m/sec in the same direction of a
train. The train crosses him in 5 seconds. If the train’s speed is 90 km/hr, find the time it takes to cross a bridge of 75 metres.Solution
Train speed = 90 × (5/18) = 25 m/sec
Relative speed = 25 - 5 = 20 m/sec
L / 20 = 5 ⇒ L = 100 metres
Time to cross bridge = (100 + 75)/25 = 175/25 = 7 seconds
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