Question
Pipe P can fill a cistern in 12 hours and pipe Q in 20
hours. If both the pipes are opened in an empty cistern, how much time will they take to fill it?Solution
Let the capacity of tank be 60 litres (LCM of 12 and 20)
Efficiency of 'P' = (60 / 12) = 5 litres/hour
Efficiency of 'Q' = (60 / 20) = 3 litres/hour
Required time = 60 ÷ (5 + 3) = 7.5 hours
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