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    Question

    A train crosses a pole and a platform of length 420

    metres in 10 seconds and 25 seconds, respectively. Find the length of train.
    A 240 metres Correct Answer Incorrect Answer
    B 260 metres Correct Answer Incorrect Answer
    C 280 metres Correct Answer Incorrect Answer
    D 300 metres Correct Answer Incorrect Answer

    Solution

    Let the speed of train be 'v' m/s.
    Length of train = '10v' metres

    So, (10v + 420) ├╖ 25 = 'v'

    Or, 10v + 420 = 25v
    Or, 15v = 420
    So, 'v' = 28

    Therefore, length of the train = 10 ├Ч 28 = 280 metres

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