BTGmoderatorLU wrote:Source: GMAT Prep
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
We can PLUG IN THE ANSWERS, which represent B's speed.
When the correct answer is plugged in, B's time - A's time = 3 hours.
For each team:
Time = distance/speed = 300/speed.
B: B's speed = 15 mph, implying that A's speed = 15+5 = 20 mph
In this case, B's time - A's time = 300/15 - 300/20 = 20 - 15 = 5 hours.
Eliminate B.
D: B's speed = 20 mph, implying that A's speed = 20+5 = 25 mph
In this case, B's time - A's time = 300/20 - 300/25 = 15 - 12 = 3 hours.
Success!
The correct answer is
D.
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