Hi Jalynn,
Remember that Saying "per" means to "divide."
Step 1: Since we know 72 gallons leave per 8 minutes, we can create this ratio: 72 gallons/8 minutes.
Step 2: In order to find the rate for one minute, we divide our ratio: 72/8 = 9
∴The rate in gallons per minute is 9 gallons per minute.
Best,
Starlyte