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    Question

    A train of length 480 metres crosses a man standing on

    platform in 24 seconds. If its speed decreases by 25%, then find the time taken by train to cross a platform of length 720 metres.
    A 70 seconds Correct Answer Incorrect Answer
    B 75 seconds Correct Answer Incorrect Answer
    C 80 seconds Correct Answer Incorrect Answer
    D 85 seconds Correct Answer Incorrect Answer
    E 90 seconds Correct Answer Incorrect Answer

    Solution

    Speed of train = (480 ÷ 24) = 20 m/s New speed of train = 0.75 × 20 = 15 m/s Required time = (480 + 720) ÷ 15
    = 1200 ÷ 15
    = 80 seconds

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