algebra
posted by Russell on .
It takes Tammy 45 minutes to ride her bike 5 miles. At this rate, how longwill it take her to ride 8 miles?

rate= 5mile/45min= 1mile/8 min
8 miles= rate*time
= 1mile/8min * time
time= 64 min 
45/5 = 9 minutes per mile
8 * 9 = ? 
72 minutes