Answer: The answer is 0.125 cups.
Explanation:
First, you need to find the unit rate of the draining.
7.5 gallons = one minute
Divide 7.5 by 60 seconds
After dividing, you should get 0.125 cups of water per second.
Therefore, the pool drained at a rate of 0.125 cups every second.
Hope this helps! :)