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?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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