Question

It takes you 28 minutes to go 8 miles. If you continue traveling at the same rate, how long will it take you to go 15 miles?

Answer 1

This is a proportion problem, and the answer is

$15 {\textrm{ miles}} \times \dfrac{28 \textrm{ minutes}}{8 {\textrm{ miles}}} = \dfrac{105}{2} = 52.5 \textrm { minutes}$

Answer 2

8 miles = 28 minutes

1 mile = 28 ÷ 8 = 3.5 minutes

15 miles = 3.5 x 15 = 52.5 minutes

Answer: 52.5 minutes