### Home > INT1 > Chapter 8 > Lesson 8.1.5 > Problem8-72

8-72.

Two cars start together and travel in the same direction. One car goes twice as fast as the other. After five hours, they are $225$ kilometers apart. How fast is each car traveling?

Remember $d = r t$. Draw a picture to visualize the situation.

Equation for car $1$: $d = r (5)$ where r is the rate and $5$ hours is the time.

Equation for car $2$: $d = 2r (5)$, where $2r$ is twice the rate and $5$ hours is still the time.

distance of car $1 +$ distance of car $2 = 225$. Solve for $r$.