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      Question

      A train takes 18 seconds to cross a 120-metre-long

      platform. If the speed of the train is 36 km/h, then find the time taken by the train to cross a 240-metre-long bridge.
      A 10 sec Correct Answer Incorrect Answer
      B 15 sec Correct Answer Incorrect Answer
      C 20 sec Correct Answer Incorrect Answer
      D 30 sec Correct Answer Incorrect Answer

      Solution

      Let the length of the train be 'x' metres.

      And speed of the train = 36 X (5/18) = 10 m/s

      So, {(x + 120) /10} = 18

      Or, x + 120 = 180

      So, x = 60

      So, required time = {(240 + 60) /10} = 30 seconds

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