CPM Homework Help : ACC7 Problem 9-120

Dawn drove $420$ miles in $6$ hours on a rural interstate highway. If she maintains the same speed, how far can she go in $7.5$ hours?

Hint:

Since Dawn will maintain the same speed, we can find the equivalent fraction for $7.5$ hours to solve for the distance.

Step 1:

$\frac{\text{miles}}{\text{hour}} = \frac{420}{6} = \frac{\it x}{7.5}$

Step 2:

$70 = \frac{\it x}{70}$

Answer:

$x = 525$ miles