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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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