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      Question

      Pipe X can fill a tank in 15 hours and pipe Y in 30

      hours. If both the pipes are opened in an empty tank, how much time will they take to fill it?
      A 10 hours Correct Answer Incorrect Answer
      B 18 hours Correct Answer Incorrect Answer
      C 14 hours Correct Answer Incorrect Answer
      D 16 hours Correct Answer Incorrect Answer

      Solution

      Let the capacity of tank be 30 litres (LCM of 15 and 30)Efficiency of 'X' = (30/15) = 2 litres/hourEfficiency of 'Y' = (30/30) = 1 litres/hourRequired time = 30 รท (2 + 1) = 10 hours

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