An inlet pipe can fill a tank in 12 hours, whereas an outlet pipe can empty the same tank in 18 hours. Find the time taken by four such inlet pipes and three such outlet pipes to fill the tank completely if all the pipes are opened together.
ATQ, Let the total capacity of the tank be 36 units (LCM of 12 and 18). 
Required time = (36/(12-6)) = 36/6 = 6 hrs
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