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      Question

      Two trains of lengths 150 m and 200 m are running in

      opposite directions at speeds of 54 km/h and 72 km/h respectively. In how many seconds will they completely cross each other?
      A 10 secs Correct Answer Incorrect Answer
      B 20 secs Correct Answer Incorrect Answer
      C 32 secs Correct Answer Incorrect Answer
      D 40 secs Correct Answer Incorrect Answer

      Solution

      Convert speeds to m/s: 54 km/h = 54 ├Ч 5/18 = 15 m/s 72 km/h = 72 ├Ч 5/18 = 20 m/s Relative speed (opposite directions) = 15 + 20 = 35 m/s Distance to be covered = 150 + 200 = 350 m Time = distance / speed = 350 / 35 = 10 s Answer: 10 seconds.

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