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"Normal Pressure" varies depending on where you live. Most municipalities try to provide water between 40 and 80 psi. That's a pretty big range. How much water comes out of your garden hose varies depending on your service pressure, the length of hose, how much water your using in your house at that moment, and where the hose is located in relation to your water service. The most accurate way for you to figure it out is to take a 5 gallon bucket (the orange Home Depot buckets are about 5 gals) and time how long it takes you to fill it. If it takes 1 minute to fill 5 gallons then you're only getting a flow rate of 5 gallons per minute (this would be uncommonly slow). If it takes 30 seconds, then you're at 10 gpm. 20 seconds -> 15 gpm, etc. If you don't need to be terribly accurate, it's pretty safe to assume somewhere between 15 to 30 gpm for normal residential service. 15 gpm is on the lame end and 30 gpm would be pretty impressive for a garden hose.
The gallons per hour that come out of a hose depends upon two things: the diameter of the hose, and the water pressure. Since both of these vary, there is no single answer to that question. However, a one inch diameter garden hose at an average household water pressure could be expected to yield about 200 gallons per hour, in my estimation. Your mileage may vary.
A pool this size has about 13,500 gallons. Most homes have pressure such that about 5 gallons per minute come through the hose. Divide 13500 by 5 and you get 2700 minutes. Divide by 60 minutes and get 45 hours, or almost 2 days.
Depends on the water pressure, and the diameter and length of the hose. Sorry, but there really is no one answer.
You must divide 750 by 4.17 which gives you 179.86 (rounded up). This is how many seconds it will take. Then you must divide 179.86 by 60 because there are 60 seconds in a minute. The Answer is 2.99 minutes. About three minutes.