A 300 gallon tan is initially empty and water is being added at a rate of 4 gallons per mintue

Answer 1

to figure out how long it will take to fill completely you just want to divide

time = total capacity / filling rate = 300 gallons / (4 gallons/minute) = 75 minutes

meaning that it will take 75 minutes to fill the 300-gallon tank

Answer 2

it will fill up in 75 minutes.

(300 gallons) / (4 gallons per minute) = 75 minutes.