SOLUTION: Could you please help me solve this problem. Thanks in advance. In a Grand Prix automobile race, Rapid Robert averaged 90 mph for the first half of the course and 110 mph fo

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Question 111882: Could you please help me solve this problem. Thanks in advance.

In a Grand Prix automobile race, Rapid Robert averaged 90 mph for the
first half of the course and 110 mph for the second half of the course.
Steady Eddy maintained a constant speed of 100 mph throughout the race.
Who won the race?


Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
the one who finishes first (shortest time) wins ___ let 2x="course distance"

time=distance/rate

RR ___ t=(x/90)+(x/110)=(11x/990)+(9x/990)=(20/990)x=(200/9900)x

SE ___ t=2x/100=(198/9900)x