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    Question

    A train takes 8 seconds to pass a

    dog running in the opposite direction to the train at a speed of 10 m/s. Given that the train is 400 meters long, determine the train's speed.
    A 45 m/s Correct Answer Incorrect Answer
    B 40 m/s Correct Answer Incorrect Answer
    C 30 m/s Correct Answer Incorrect Answer
    D 48 m/s Correct Answer Incorrect Answer

    Solution

    ATQ, Let assume the speed of the train is 'p' m/s ATQ; 400 = (10 + p) × 8 Or, 400 = 80 + 8p Or, (400 - 80) = 8p Or, 8p = 320 Or, p = 40 Required speed of the train = 40 m/s

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