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    Question

    A train crosses a 400-metre-long platform in 25 seconds,

    and the same train crosses a tunnel 25% longer than the platform in 30 seconds. Find the speed of train in km/h.
    A 72 km/hr Correct Answer Incorrect Answer
    B 75 km/hr Correct Answer Incorrect Answer
    C 66 km/hr Correct Answer Incorrect Answer
    D 60 km/hr Correct Answer Incorrect Answer

    Solution

    Let the length and speed of train be ‘l’ metres and ‘x’ m/s, respectively.
    Then, according to question,
    (l + 400)/25 = (l + 500)/30
    6l + 2400 = 5l + 2500
    l = 100
    l = 100 metres
    x = (l + 400)/25 = 500/25 = 20 m/s = 20×(18/5) = 72 km/h

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