Question
Pipe A can fill a tank in 12 hours and pipe B in 18 hours.
If both the pipes are opened in an empty tank, how much time will they take to fill it?Solution
Let the capacity of tank be 36 litres (LCM of 12 and 18)Efficiency of 'A' = (36/12) = 3 litres/hourEfficiency of 'B' = (36/18) = 2 litres/hourRequired time = 36 ÷ (3 + 2) = 7.2 hours
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