Question From Readers #15: Calculate Time To Empty The Tank

How Long Will It Take To Empty The Tank

A tank measures 3 feet x 32 feet x 40 feet. How long will it take to empty the tank if the pumps discharge rate is 120 gallons per min.

Solution:

1. Calculate the volume of the tank.

               Volume = 3 ft x 32 ft x 40 ft
                           = 3, 840 cubic feet

2. Convert cubic feet into gallons. But how many gallons in 1 cubic foot? It's 7.48 gallons.

              3, 840 ft³
         x       7.48    
              28, 732.2 gallons
        ÷          120      gal/min        to get time to empty the the tank
               239.36 minutes
         ÷      60                        to convert it into hours
              3.98933 hrs or 3 hrs 59 min 21 sec to empty the tank

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