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    Question

    A train of length 300 metres crosses a man standing on

    platform in 15 seconds. If its speed decreases by 20%, then find the time taken by train to cross a platform of length 420 metres.
    A 40 seconds Correct Answer Incorrect Answer
    B 45 seconds Correct Answer Incorrect Answer
    C 48 seconds Correct Answer Incorrect Answer
    D 52 seconds Correct Answer Incorrect Answer
    E 50 seconds Correct Answer Incorrect Answer

    Solution

    Speed of train = (300 ÷ 15) = 20 m/s New speed of train = 0.8 × 20 = 16 m/s Required time = (300 + 420) ÷ 16
    = 720 ÷ 16
    = 45 seconds

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