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      Question

      800 metres long train crosses a man who is moving in the

      same direction with a certain speed, in 40 seconds. If the same train can cross a tree in 20 seconds with the same speed, then find the speed of the man.
      A 23 m/sec Correct Answer Incorrect Answer
      B 24 m/sec Correct Answer Incorrect Answer
      C 20 m/sec Correct Answer Incorrect Answer
      D 22 m/sec Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Speed of train = 800/20 = 40 m/sec Let the speed of the man be ‘s’ m/sec Relative speed of the train = (40 – s) m/sec According to the question, (40 – s) = 800/40 Or, s = 40 – 20 = 20 Therefore, speed of the man = 20 m/sec

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