### Home > CC3MN > Chapter 7 > Lesson 7.2.5 > Problem7-69

7-69.

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

1. How far can the girls ride in $45$ minutes?

Set up a proportion.

$\frac{3}{20}=\frac{\it y}{45}$

$20y=135$

$y=6.75$ miles

2. 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.

You can also use a proportion for this problem.

$\frac{3}{20}=\frac{\it y}{\it x}$

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