Question
Pipe X can fill a pool in 18 hours and pipe Y in 36 hours.
If both the pipes are opened in an empty pool, how much time will they take to fill it?Solution
Let the capacity of tank be 36 litres (LCM of 18 and 36)Efficiency of 'X' = (36/18) = 2 litres/hourEfficiency of 'Y' = (36/36) = 1 litres/hourRequired time = 36 ÷ (2 + 1) = 12 hours
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