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We have a 345 gallon hot tub that fills at a rate of 3.61 gallons/min.
To calculate filling time, we need to divide as it follows:
[tex]t=\frac{345\text{gal}}{3.61\frac{\text{gal}}{\min }}[/tex]in that way we can find how much time does it take in minutes
[tex]t=\frac{345}{3.61}=95.56786[/tex]now, if we want to determine time in hours, we must divide by 60, because there are 60 min. in one hour.
[tex]t=\frac{345}{3.61}\cdot\frac{1}{60}=1.59279[/tex]Then, it would take approximately 1.59 hours to fill the hot tub.