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      Question

      A person is walking at 6 m/sec in the same direction of

      a train. The train crosses him in 5 seconds. If speed of the train is 108 km/hr, find the time taken to cross a bridge of 90 metres.
      A 5 seconds Correct Answer Incorrect Answer
      B 6 seconds Correct Answer Incorrect Answer
      C 7 seconds Correct Answer Incorrect Answer
      D 8 seconds Correct Answer Incorrect Answer

      Solution

      Train speed = 108 × (5/18) = 30 m/sec
      Relative speed = 30 - 6 = 24 m/sec
      L / 24 = 5 ⇒ L = 120 metres
      Time to cross bridge = (120 + 90)/30 = 210/30 = 7 seconds

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