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    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.
    A 7 seconds Correct Answer Incorrect Answer
    B 8 seconds Correct Answer Incorrect Answer
    C 9 seconds Correct Answer Incorrect Answer
    D 10 seconds Correct Answer Incorrect Answer

    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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