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      Question

      A train 180 m long crosses another train 220 m long

      moving in the opposite direction in 10 seconds. If the speed of the first train is 54 km/h, then the speed of the second train is:
      A 77 km/h Correct Answer Incorrect Answer
      B 90 km/h Correct Answer Incorrect Answer
      C 45 km/h Correct Answer Incorrect Answer
      D 37 km/h Correct Answer Incorrect Answer

      Solution

      ATQ, Total distance = 180 + 220 = 400 m Relative speed = 400 / 10 = 40 m/s Convert 40 m/s into km/h: 40 x 18/5 = 144 km/h Speed of first train = 54 km/h Speed of second train = 144 - 54 = 90 km/h

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