Solve the Problem $18 \mathrm{mi}$ , the Distance Between the Cars Was

Multiple Choice

Solve the problem.
-Two cars leave an intersection. One car travels north; the other east. When the car traveling north had gone $18 \mathrm{mi}$ , the distance between the cars was $6 \mathrm{mi}$ more than the distance traveled by the car heading east. How far had the eastbound car traveled?

A) $18 \mathrm{mi}$
B) $24 \mathrm{mi}$
C) $36 \mathrm{mi}$
D) $30 \mathrm{mi}$