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    Question

    A train crosses a pole and a platform of length 300

    metres in 5 seconds and 20 seconds, respectively. Find the length of train.
    A 60 metres Correct Answer Incorrect Answer
    B 80 metres Correct Answer Incorrect Answer
    C 100 metres Correct Answer Incorrect Answer
    D 120 metres Correct Answer Incorrect Answer

    Solution

    Let the speed of train be 'v' m/s.
    Length of train = '5v' metres

    So, (5v + 300) ÷ 20 = 'v'

    Or, 5v + 300 = 20v
    Or, 15v = 300
    So, 'v' = 20

    Therefore, length of the train = 5 × 20 = 100 metres

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