Answer:
2:30 PM
Explanation:
9:30 AM... 0 gallons
10:30 AM... 900 gallons
11:30 AM ... 1800 gallons
12:30 PM... 2700 gallons
1:30 PM... 3600 gallons
2:30 PM ... 4500 gallons
The pool is 4500 gallons of water, so which means at 2:30 PM the pool will be full!