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    Question

    1260 metres long train crosses a man who is moving in

    the same direction with a certain speed in 30 seconds. If the same train can cross a pole in 21 seconds with the same speed, then find the speed of the man.
    A 16 m/sec Correct Answer Incorrect Answer
    B 25 m/sec Correct Answer Incorrect Answer
    C 22 m/sec Correct Answer Incorrect Answer
    D 18 m/sec Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the speed of the man be lsquo;xrsquo; m/sec. Speed of train = 1260/21 = 60 m/sec Relative speed of the train = (60 ndash; x) m/sec According to the question, =gt; (60 ndash; x) = 1260/30 =gt; x = 60 ndash; 42 =gt; x = 18 Therefore the speed of the man = 18 m/sec

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