Answer:
120 x 60 = 7,200 gallons.
148,000 - 85,000 = 63,000 gallons.
63,000 divided by 7,200 = 8.75
It will take 8 hours and 45 minutes to fill the tank.
Step-by-step explanation:
120 gallons per minute would equal to 7,200 gallons an hour.
148,000 gallons - 85,000 gallons = 63,000 gallons. 63,000 gallons of water is how much is needed to reach the tanks capacity.
63,000 gallons divided by 7,200 gallons would be 8.75. That means it will take 8 hours and 45 minutes to fill the tank from 85,000 gallons.
I don't know if you need a more simplified equation, but I hope this helps in some way.