Those TWO pumps together work at a rate 100 gallons per minute.
You have basement dimensions, but to get volume as gallons, you need to know:
This is wrong: 231 cubic feet = 1 gallon
Know these: 231 cubic inches = 1 gallon, 12 inches = 1 foot
, cubic feet, the volume of water in the basement - which seems to be given in two sections.
You would use a uniform rates formula like RT=V for rate, time, volume.
You would use it as T=V/R.
