Distance/Rate Problems, Word Problems

Runners $X$ and $Y$ started an $18$-mile race at the same time. Runner $X$ completed the course in $6$ hours, and Runner $Y$ finished $2$ hours earlier. Runner $Y$ ran an average of how many miles per hour faster than Runner $X?$

A. $1$

B. $1\dfrac{1}{2}$

C. $2\dfrac{1}{4}$

D. $3$

E. $4\dfrac{1}{2}$

The OA is B

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