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      Question

      There are two trains A and B. A start from point

      X at 9 AM towards point Y. Another train B starts at 10 AM from point X. If they meet at 12 PM and speed of A is 21 km/hr, while that of B is 36 km/hr. Find distance between X and Y.
      A 125 km Correct Answer Incorrect Answer
      B 135 km Correct Answer Incorrect Answer
      C 220 km Correct Answer Incorrect Answer
      D 100 km Correct Answer Incorrect Answer
      E 240 km Correct Answer Incorrect Answer

      Solution

      Speed of train A = 21 kmph
      Speed of train B = 36 kmph
      Time taken by train A to meet train B at 12 AM = 3 hrs
      Time taken by train B to meet train A at 12 AM = 2 hrs
      Distance travelled by train A = 3 × 21 = 63 km
      Distance travelled by train B = 2 × 36 = 72 km
      Therefore, total distance between X and Y = 63 + 72 = 135 km

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