Hey!
Hope this Helps...
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We know these 2 things...
(1) We are assuming Jim needs 300 juice boxes every hour = x amount of gallons...
(2) there are 16 cups in a gallon...
Now that we know those 2 things, lets get to work...
300 / 60 = 5 juice boxes a minute
0.8 * 5 = 4 cups of juice every minute
4 * 60 = 240 cups of juice every hour
240 / 16 = 15 gallons of juice every hour
Jim needs 15 gallons of juice made every hour...