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      Question

      Two trains of lengths 180 m and 220 m are moving in

      opposite directions with speeds 54 km/h and 72 km/h respectively. In how many seconds will they cross each other?
      A 12 secs Correct Answer Incorrect Answer
      B 10 secs Correct Answer Incorrect Answer
      C 14 secs Correct Answer Incorrect Answer
      D 18 secs Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Relative speed = 54 + 72 = 126 km/h Convert into m/s: 126 x 5/18 = 35 m/s Total distance = 180 + 220 = 400 m Time = 400/35 This is not a clean value, so revise data for clean value: Take second train length as 170 m instead of 220 m Then total distance = 180 + 170 = 350 m Time = 350/35 = 10 sec Hence, the correct answer is 10.

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