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      Question

      A person is walking at 4 m/sec in the same direction of

      a train. The train crosses him in 7 seconds. If train speed is 72 km/hr, find the time to cross a bridge of 84 metres.
      A 9.4 seconds Correct Answer Incorrect Answer
      B 9.6 seconds Correct Answer Incorrect Answer
      C 9.8 seconds Correct Answer Incorrect Answer
      D 10.0 seconds Correct Answer Incorrect Answer

      Solution

      Train speed = 72 × (5/18) = 20 m/sec
      Relative speed = 20 - 4 = 16 m/sec
      L / 16 = 7 ⇒ L = 112 metres
      Time to cross bridge = (112 + 84)/20 = 196/20 = 9.8 seconds

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