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      Question

      Train X, traveling at a speed of 72 km/hr, crosses

      another train Y, which is moving in the opposite direction at a speed of 108 km/hr, in 't' seconds. If the ratio of the lengths of train X and train Y is 3:2, and train X crosses a pole in 30 seconds, find the value of (t + 11).
      A 35 Correct Answer Incorrect Answer
      B 31 Correct Answer Incorrect Answer
      C 33.5 Correct Answer Incorrect Answer
      D 23 Correct Answer Incorrect Answer
      E 21 Correct Answer Incorrect Answer

      Solution

      Length of train X = 30 × 72 × (5/18) = 600 m Length of train Y = (600/3) × 2 = 400 m => t = (600 + 400)/[(72 + 108) ×(5/18)] = 20 sec Required value = (t + 11) = 20 + 11 = 31

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