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      Question

      A can copy 60 pages in 12 hours, A and B together can

      copy 120 pages in 20 hours. Then in how many hours B can copy 11 pages.
      A 14 hours Correct Answer Incorrect Answer
      B 10 hours Correct Answer Incorrect Answer
      C 11 hours Correct Answer Incorrect Answer
      D 16 hours Correct Answer Incorrect Answer

      Solution

      Number of pages copied by x in hour = 60/12 = 5 Number of pages copied by x and y in 1 hour = 120/20 = 6 ∴ Number of pages copied by y in 1 hour = 6 – 5 = 1 ∴ Required time = 1 x 11 = 11 hours

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