Question
Pipe A can fill a tank in 20 hours and pipe B in 30 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 60 litres (LCM of 20 and 30)Efficiency of 'A' = (60/20) = 3 litres/hourEfficiency of 'B' = (60/30) = 2 litres/hourRequired time = 60 ÷ (3 + 2) = 12 hours
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