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      Question

      Train A, moving at 90 km/h, crosses a pole in 8 seconds.

      Find the time it takes to cross another train of equal length, coming from the opposite direction at 90 km/h.
      A 6 seconds Correct Answer Incorrect Answer
      B 7 seconds Correct Answer Incorrect Answer
      C 8 seconds Correct Answer Incorrect Answer
      D 9 seconds Correct Answer Incorrect Answer

      Solution

      Speed of Train A = 90 ├Ч 5/18 = 25 m/s
      Length of Train A = 25 ├Ч 8 = 200 m
      Length of Train B = 200 m
      Speed of Train B = 90 ├Ч 5/18 = 25 m/s
      Total length = 200 + 200 = 400 m
      Relative speed = 25 + 25 = 50 m/s
      Time = 400 / 50 = 8 seconds

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