Answer:
3 hours
Step-by-step explanation:
First it holds 3,000 and you already have 600 in it.
3,000 - 600 = 2,400
Now if your hose spits out 800 gallons per hour you need to divide 2,400 by 800.
2,400/800 = 3
it will take your hose 3 hours to fill the rest of your pool.