Question
Pipe M can fill a tank in 24 hours and pipe N in 40 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 120 litres (LCM of 24 and 40)
Efficiency of 'M' = (120/24) = 5 litres/hour
Efficiency of 'N' = (120/40) = 3 litres/hour
Required time = 120 ÷ (5 + 3) = 15 hours
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