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      Question

      A train crosses a platform 100 m long in 60 s at a speed

      of 45 km/h. The time taken by the train to cross an electric pole is
      A 8 s Correct Answer Incorrect Answer
      B 52 s Correct Answer Incorrect Answer
      C 1 min Correct Answer Incorrect Answer
      D 40 s Correct Answer Incorrect Answer

      Solution

      Let the length of the train be D,

      Then, S = D/T

      45 x (5/18) = (D + 100)/60

      D = 650 m

      Now, when trains crosses the electric pole

      45 x (5/18) = 650/T

      T = 52 sec

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