An inlet pipe can fill a tank in 10 hours, whereas an outlet pipe can empty the same tank in 25 hours. Find the time taken by two such inlet pipes and one such outlet pipe to fill the tank completely if all the pipes are opened together.
ATQ, Let the total capacity of the tank be 50 units (LCM of 10 and 25). 
Required time = 50/(10-2) = 50/8 = 6.25 hrs
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