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      Question

      Pipe D can fill a pool in 6 hours and pipe E in 12 hours.

      If both the pipes are opened in an empty pool, how much time will they take to fill it?
      A 2 hours Correct Answer Incorrect Answer
      B 4 hours Correct Answer Incorrect Answer
      C 6 hours Correct Answer Incorrect Answer
      D 8 hours Correct Answer Incorrect Answer

      Solution

      Let the capacity of tank be 12 litres (LCM of 6 and 12)
      Efficiency of 'D' = (12/6) = 2 litres/hour
      Efficiency of 'E' = (12/12) = 1 litres/hour
      Required time = 12 ÷ (2 + 1) = 4 hours

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