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      Question

      Two trains X and Y start at the same time in the

      opposite direction from two points P and Q and arrive at their destinations 25 and 16 hours respectively after their meeting each other. At what speed does the second train Y travel if the first train travels at 48 km/h. 
      A 75 km/h Correct Answer Incorrect Answer
      B 60 km/h Correct Answer Incorrect Answer
      C 96 km/h Correct Answer Incorrect Answer
      D 108 km/h Correct Answer Incorrect Answer
      E 72 km/h Correct Answer Incorrect Answer

      Solution

      Let the speed and time of two trains be s1 and s2, and t1 and t2. s1/s2 = (t2/t1)1/2 => 48/s2 = 4/5 => s2 = 60 km/hr.

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