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    Question

    Train A running with a sped of 18 km/h crosses a

    vertical pole in 7 seconds. Speed of train A is 6 m/s less than speed of train B, and length of train B is 20 metres less than length of train A. Find the time taken by train B to cross a 282 metre long tunnel.
    A 20 seconds Correct Answer Incorrect Answer
    B 22 seconds Correct Answer Incorrect Answer
    C 25 seconds Correct Answer Incorrect Answer
    D 27 seconds Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of train A = 18 × 5/18 = 5 m/s Speed of train B = 11 m/s Length of train A = 5 × 7 = 35 metres Length of train B = 35 – 20 = 15 metres Desired time = (15 + 282)/11 = 27 seconds

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