Question
Pipe C can fill a tank in 10 hours and pipe D in 15 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 30 litres (LCM of 10 and 15)Efficiency of 'C' = (30/10) = 3 litres/hourEfficiency of 'D' = (30/15) = 2 litres/hourRequired time = 30 ÷ (3 + 2) = 6 hours
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