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    Question

    A train of 250 metres is moving at a speed of 90 km/h.

    It completely crosses a platform in 45 seconds. What is the platform’s length?
    A 480 m Correct Answer Incorrect Answer
    B 665 m Correct Answer Incorrect Answer
    C 775 m Correct Answer Incorrect Answer
    D 875 m Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the length of the platform be ‘x’ metres

    Speed of the train = 90 × (5/18) = 25 m/s

    ATQ,

    (x + 250) = 25 × 45

    Or, (x + 250) = 1125

    Or, x = 1125 - 250

    Or, x = 875

    Therefore, the length of the platform = 875 metres

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