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    • Question

      A can copy 60 pages in 15 hours, A and B together can

      copy 126 pages in 21 hours. Then in how many hours B can copy 12 pages.
      A 24 hours Correct Answer Incorrect Answer
      B 21 hours Correct Answer Incorrect Answer
      C 22 hours Correct Answer Incorrect Answer
      D 26 hours Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Number of pages copied by x in hour = 60/15 = 4
      Number of pages copied by x and y in 1 hour = 126/21 = 6
      ∴ Number of pages copied by y in 1 hour = 6 – 4 = 2
      ∴ Required time = 2 x 12 = 24 hours.

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