Question

Sandra can run 3 miles in 20 minutes. How many minutes will it take her to run 7 miles?

Answer 1

46.7 minutes to run 7 miles

Explanation:

3 miles in 20 minutes boils down to the unit rate 3/20 miles/minute.

Multiply 7 miles by the unit rate (20/3 minutes/mile):

(7)(20)

---------- minutes, or approximately 46.7 minutes to run 7 miles

3