SOLUTION: an athlete runs at 9 mph and then at 12 mph, covering 10 miles in one hour. how long does the athlete run at each speed? using the substitution method.

SOLUTION: an athlete runs at 9 mph and then at 12 mph, covering 10 miles in one hour. how long does the athlete run at each speed? using the substitution method.

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Question 949251: an athlete runs at 9 mph and then at 12 mph, covering 10 miles in one hour. how long does the athlete run at each speed? using the substitution method.
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Rate x Time= Distance

So then,

Substituting into the first equation,

So then,

2/3 hr(40 min) at 9 mph and 1/3 hr(20 min) at 12 mph

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