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    Question

    What is the speed of the train?

    I. The train crosses the signal pole in 6 seconds.

    II. The train crosses a platform of equal length in 18 seconds.

    III. Length of train is 360 meters.

    A I and II needed Correct Answer Incorrect Answer
    B II and III needed Correct Answer Incorrect Answer
    C All I, II, III needed Correct Answer Incorrect Answer
    D Only III and either I or II needed Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    From I , Let the length of train be D and speed of train be s. D = s x 6……..(i) From II , 2D = s x 12 D = 6s …………(ii) From III , D = 360……….(iii) From I & III D = 6s 360 = 6s s = 60 m/s From II & III D = 6s 360 = 6s s = 60 m/s

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