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
OA C
Source: GMAT Prep
Two dogsled teams raced across a 300 mile course in Wyoming. Team A finished
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