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    Question

    A train, 'A,' which is 180 meters long, takes 14 seconds to

    cross a 100-meter-long bridge. If the lengths of trains 'A' and 'B' are in a ratio of 6:5, and train 'B' travels at a speed that is 25% faster than train 'A,' how much time will train 'B' take to cross the same bridge?
    A 12 sec Correct Answer Incorrect Answer
    B 8 sec Correct Answer Incorrect Answer
    C 10 sec Correct Answer Incorrect Answer
    D 16 sec Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the speed of 'A' be 'x' m/sec.

    ATQ,

    {(180 + 100) /x} = 14

    (280/x) = 14

    So, 'x' = 20

    So, speed of 'B' = 20 X 1.25 = 25 m/sec

    Length of train 'B' = 180 X (5/6) = 150 metres

    Required time = (150 + 100) /25 = 10 seconds

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