Question
An inlet pipe can fill a tank in 8 hours, whereas an
outlet pipe can empty the same tank in 16 hours. Find the time taken by three such inlet pipes and two such outlet pipes to fill the tank completely if all the pipes are opened together.Solution
ATQ, Let the total capacity of the tank be 16 units (LCM of 8 and 16). 
Required time = 16/(6-2) = 16/4 = 4 hours
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