### Home > CC3 > Chapter 7 > Lesson 7.2.5 > Problem 7-81

7-81.

Aja and Emilie were riding their skateboards. They knew that they could ride 3 miles in 20 minutes. Homework Help ✎

How far can the girls ride in 45 minutes?

If

*y*represents the distance in miles and*x*represents the time in minutes, write an equation to represent the distance traveled for any time.

Set up a proportion.

20*y* = 135

*y* = 6.75 miles

You can also use a proportion for this problem.

Multiply both sides by *x* to simplify the equation.