Two dogsled teams raced across a $300$-mile course in Wyoming. Team $A$ finished the course in $3$ fewer hours

Two dogsled teams raced across a $300$-mile course in Wyoming. Team $A$ finished the course in $3$ fewer hours than team $B.$ If team $A$'s average speed was $5$ mph greater than team $B$'s, what was team $B$'s average mph?

A. 12
B. 15
C. 18
D. 20
E. 25

Answer: D

Source: GMAT Prep

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