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    Question

    Train A running with a sped of 90 km/h crosses a

    vertical pole in 12 seconds. Speed of train A is 5 m/s less than speed of train B, and length of train B is 88 metres less than length of train A. Find the time taken by train B to cross a 202 metre long tunnel.
    A 10.8 seconds Correct Answer Incorrect Answer
    B 11.8 seconds Correct Answer Incorrect Answer
    C 13.8 seconds Correct Answer Incorrect Answer
    D 12.8 seconds Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of train A = 90 ├Ч 5/18 = 25 m/s Speed of train B = 30 m/s Length of train A = 12 ├Ч 25 = 300 metres Length of train B = 300 тАУ 88 = 212 metres Desired time = (212 + 202)/30 = 13.8 seconds

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