SOLUTION: An athlete runs at 9 mph and then at 12 mph, covering 10 miles in 1hour. How long does the athlete run at each speed?

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Question 483440: An athlete runs at 9 mph and then at 12 mph, covering 10 miles in 1hour. How long does the athlete run at each speed?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
9n+12(1-n)=10
9n+12-12n=10
3n=2
n=2/3
The athlete ran at 9 mph for 2/3 hours; and at 12 mph for 1/3 hours..