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      Question

      A can copy 65 pages in 13 hours, A and B together can

      copy 150 pages in 15 hours. Then in how many hours B can copy 10 pages.
      A 54 hours Correct Answer Incorrect Answer
      B 60 hours Correct Answer Incorrect Answer
      C 50 hours Correct Answer Incorrect Answer
      D 56 hours Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Number of pages copied by x in hour = 65/13 = 5
      Number of pages copied by x and y in 1 hour = 150/15 = 10
      ∴ Number of pages copied by y in 1 hour = 10 – 5 = 5
      ∴ Required time = 5 x 10 = 50 hours

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