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      Question

      Length of a train is double the length of a platform.

      If the train crosses the platform in 72 seconds, then find the time taken by train to cross a pole.
      A 36 seconds Correct Answer Incorrect Answer
      B 30 seconds Correct Answer Incorrect Answer
      C 48 seconds Correct Answer Incorrect Answer
      D 24 seconds Correct Answer Incorrect Answer

      Solution

      Let the speed of train be 'v' m/s and the length of platform be 'L' metres.

      Length of train = '2L' metres

      So, (L + 2L) = '72v'

      Or, 3L = 72v

      So, 'L' = 24v ---------- (I)

      Required time = (2L/v)

      = (48v/v) [from equation (I) ]

      = 48 seconds

      Hence, option c.

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