Question 70666
Hmmm...I wonder how you found the volume of water in the basement to be 165,888 cu.ft.?
The volume is given by Length X Width X depth(of water)
Length = 32 ft.
Width = 24 ft.
Depth = 18 inches = 1.5 ft.
Volume = 32 X 24 X 1.5 = 1152 cu.ft. of water. Right?
To compute the number of gallons, using 7.5 gallons per cubic foot, multiply the number of cubic feet of water (1152) by the number of gallons per cubic foot (7.5) and you get 8640 gallons of water.
Now if the three pumps are all working together and each one pumps 8 gallons per minute, then the three of them together will pump (8 X 3 = 24) 24 gallons per minute.
To find the time it takes to empty the basement, divide the number of gallons of water in the basement (8640 gallons) by the rate at which the water is being pumped out by the three pumps (24 gals/min).
8640 gals./24 gals/min = 360 mins.