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    Question

    Train A running with a sped of 198 km/h crosses a

    vertical pole in 10 seconds. Speed of train A is 6 m/s less than speed of train B, and length of train B is 90 metres less than length of train A. Find the time taken by train B to cross a 211 metre long tunnel.
    A 10 seconds Correct Answer Incorrect Answer
    B 12 seconds Correct Answer Incorrect Answer
    C 11 seconds Correct Answer Incorrect Answer
    D 9 seconds Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of train A = 198 × 5/18 = 55 m/s Speed of train B = 61 m/s Length of train A = 10 × 55 = 550 metres Length of train B = 550 – 90 = 460 metres Desired time = (460 + 211)/61 = 11 seconds

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