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    Question

    A train crosses a pole in 18 seconds and crosses a

    platform 270 m long in 36 seconds. What is the speed of the train?
    A 77 km/h Correct Answer Incorrect Answer
    B 54 km/h Correct Answer Incorrect Answer
    C 47 km/h Correct Answer Incorrect Answer
    D 37 km/h Correct Answer Incorrect Answer

    Solution

    Let the length of the train be x m. Then speed = x/18 m/s While crossing the platform: Distance covered = x + 270 So, (x + 270)/36 = x/18 18(x + 270) = 36x 18x + 4860 = 36x 18x = 4860 x = 270 Speed = 270/18 = 15 m/s Convert into km/h: 15 x 18/5 = 54 km/h

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