SOLUTION: An inlet pipe can fill a tank in 6 minutes. A drain can empty the tank in 18 minutes. If the tank is empty, and both the pipe and drain are open, how long will it take before the t

Question 899860: An inlet pipe can fill a tank in 6 minutes. A drain can empty the tank in 18 minutes. If the tank is empty, and both the pipe and drain are open, how long will it take before the tank overflows?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi

x being time for the overflow...

traditional Set Up

  |Multiplying thru by 18x so as all denominators = 1

  3x + x = 18

   4x = 18

    x = 18/4 = 9/2 = 4.2 hr, tank overflows 

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