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    Question

    Train A running with a sped of 180 km/h crosses a

    vertical pole in 15 seconds. Speed of train A is 5 m/s less than speed of train B, and length of train B is 50 metres less than length of train A. Find the time taken by train B to cross a 180 metre long tunnel.
    A 16 seconds Correct Answer Incorrect Answer
    B 10 seconds Correct Answer Incorrect Answer
    C 18 seconds Correct Answer Incorrect Answer
    D 19 seconds Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Speed of train A = 180 × 5/18 = 50 m/s Speed of train B = 55 m/s Length of train A = 15 × 50 = 750 metres Length of train B = 750 – 50 = 700 metres Desired time = (700 + 180)/55 = 16 seconds

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