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      Question

      Pipe M can fill a tank in 24 hours and pipe N in 40 hours.

      If both the pipes are opened in an empty tank, how much time will they take to fill it?
      A 14 hours Correct Answer Incorrect Answer
      B 16 hours Correct Answer Incorrect Answer
      C 15 hours Correct Answer Incorrect Answer
      D 20 hours Correct Answer Incorrect Answer

      Solution

      Let the capacity of tank be 120 litres (LCM of 24 and 40)
      Efficiency of 'M' = (120/24) = 5 litres/hour
      Efficiency of 'N' = (120/40) = 3 litres/hour
      Required time = 120 ├╖ (5 + 3) = 15 hours

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