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    Question

    A train crosses a pole and a platform of length 480 metres

    in 8 seconds and 20 seconds, respectively. Find the length of train.
    A 280 metres Correct Answer Incorrect Answer
    B 300 metres Correct Answer Incorrect Answer
    C 320 metres Correct Answer Incorrect Answer
    D 340 metres Correct Answer Incorrect Answer
    E 360 metres Correct Answer Incorrect Answer

    Solution

    Let the speed of train be 'v' m/s.
    Length of train = '8v' metres

    So, (8v + 480) ÷ 20 = 'v'

    Or, 8v + 480 = 20v
    Or, 12v = 480
    So, 'v' = 40

    Therefore, length of the train = 8 × 40 = 320 metres

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