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      Question

      'P' and 'Q' together can complete the work in 12 days.

      'Q' alone can complete the work in 36 days. If R is 50% more efficient than P, find the time taken by 'R' alone to finish the work.
      A 10 days Correct Answer Incorrect Answer
      B 12 days Correct Answer Incorrect Answer
      C 16 days Correct Answer Incorrect Answer
      D 8 days Correct Answer Incorrect Answer

      Solution

      Let the total work be 72 units

      Combined efficiency of 'P' and 'Q' = (72/12) = 6 units/day

      Efficiency of 'Q' alone = (72/36) = 2 units/day

      Efficiency of 'P' alone = 6 - 2 = 4 units/day

      Efficiency of 'R' = 4 Γ— (3/2) = 6 units/day

      Time taken by 'R' alone to finish the work = 72 Γ· 6 = 12 days

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