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      Question

      A train 400 metres long is running at a speed of 54

      km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is:
      A 620 m Correct Answer Incorrect Answer
      B 500 m Correct Answer Incorrect Answer
      C 420 m Correct Answer Incorrect Answer
      D 680 m Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the length of the tunnel be โ€˜xโ€™ meter. Speed = 54 ร— (5/18) m/sec = 15 m/sec Time = 1 minute = 60 seconds. Let the length of the tunnel be x metres. Then, (400 + x)/60 = 15 =>(400 + x) = 900 => x = 500 m

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