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    Question

    A train that is 210.5 metres long is moving at a speed of

    60 km/h. It crosses a platform in 42 seconds. What is the length of the platform?
    A 489.5 m Correct Answer Incorrect Answer
    B 525.5 m Correct Answer Incorrect Answer
    C 665.7 m Correct Answer Incorrect Answer
    D 335.3 m Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the length of the platform be ‘x’ metres

    Speed of the train = 60 × (5/18) = 16.67 m/s

    ATQ,

    (x + 210.5) = 16.67 × 42

    Or, (x + 210.5) = 700

    Or, x = 700 - 210.5

    Or, x = 489.5

    Therefore, the length of the platform = 489.5 metres

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