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      Question

      1500 metres long train crosses a man who is moving in

      the same direction with a certain speed, in 50 seconds. If the same train can cross a tree in 15 seconds with the same speed, then find the speed of the man.
      A 70 m/sec Correct Answer Incorrect Answer
      B 75 m/sec Correct Answer Incorrect Answer
      C 74 m/sec Correct Answer Incorrect Answer
      D 73 m/sec Correct Answer Incorrect Answer

      Solution

      Speed of train = 1500/15 = 100 m/sec Let the speed of the man be โ€˜sโ€™ m/sec Relative speed of the train = (100 โ€“ s) m/sec According to the question, (100 โ€“ s) = 1500/50 Or, s = 100 โ€“ 30 = 70 Therefore, speed of the man = 70 m/sec

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