Answer:
90.2 gallons
Explanation:
First, find out how many quarts come from one shower; you can do this by multipling the time by the amount of quarts:
8.8 x 8.2 = 72.16
Then multiply that by 5:
72.16 x 5 = 360.8
Since you want the gallons, not quarts, you can divide this value by 4 ( since there are 4 quarts in one gallon):
360.8 / 4 = 90.2