Answer:
you need to substitute values on the next form of resolving this problem as follows...
 A hose fills up a hot tub at a rate of 3.2 gallons per minute. How many hours will it take to fill a 300 gallon hot tub? 
please explain the method of unit conversions as thoroughly as possible. 
 
Solution: 
 
The rate of fill up is, Rate = 3.2 Gallons / minute = 3.2 g/min 
The hut tub volume is 300 Gallons 
 
You can set up this problem as follows: 
 
Every 3.2 gallons require 1 minute, How many minutes 300 gallons require? 
 
3.2 g 1min 
300 g ? min = (300 gallons x 1min/ 3.2 gallons)=(300/32)min 
 
= 93.75 min 
 
or simply the number minutes is the time required (T) the rate is (R) and the volume is (V) 
such that T=V/R= (300g/3.2 g/min)= 93.75 min