Answer:
they drink 7 1/5 ounces in 1 2/5 hours, and they drink 6 ounces per hours
Explanation:
this can help us figure out how much they drink per hour, since there are 72 minutes in 1 2/5 hours we can divided 7 1/2 ÷ 72=.1 and then .1 x 60=6
they drink 6 ounces per hour