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    Question

    A train travelling with a speed of 36 km/h can cross a

    pole in 9 seconds. Find the time taken by the train to cross a 180 metres long platform if the speed of train is increased by 20%.
    A 15 seconds Correct Answer Incorrect Answer
    B 22.5 seconds Correct Answer Incorrect Answer
    C 14 seconds Correct Answer Incorrect Answer
    D 10 seconds Correct Answer Incorrect Answer

    Solution

    Speed of train = 36 Ă— 5/18 = 10 m/s Length of train = 10 Ă— 9 = 90 metres Desired time = (180 + 90)/(1.20 Ă— 10) = 22.5 seconds

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