Answer:
0.42 gallons per hour
Explanation:
25.2 gallons
If it uses 5.04 gallons of water in 12mins
Then, 1min=5.04/21
=0.42 gallons
1hrs=60mins
So, 60×0.42=25.2 gallons
OR
1hrs is equal to 60mins and 60÷12=5
So, 5.04×5=25.2 gallons
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