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    Question

    Length of a train, whose speed is 36 km/h, is 180

    metres. Find the time taken (in seconds) by train to cross a bridge of length 120 metres.
    A 25 seconds Correct Answer Incorrect Answer
    B 30 seconds Correct Answer Incorrect Answer
    C 36 seconds Correct Answer Incorrect Answer
    D 40 seconds Correct Answer Incorrect Answer

    Solution

    Speed of train = 36 km/h = 36 × (5/18) = 10 m/s
    Required time = (180 + 120) ÷ 10 = 300 ÷ 10 = 30 seconds

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