Question
A person is walking at 4 m/sec in the same direction of
a train. The train crosses him in 5 seconds. If train speed is 72 km/hr, find the time it takes to cross a bridge of 100 metres.Solution
Train speed = 72 × (5/18) = 20 m/sec
Relative speed = 20 - 4 = 16 m/sec
L / 16 = 5 ⇒ L = 80 metres
Time to cross bridge = (80 + 100)/20 = 180/20 = 9 seconds
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