SOLUTION: Stu trained for 3 hours yesterday. He ran 15 miles and then biked 44 miles. His biking speed is 7 mph faster than his running speed. What is his running speed in miles per hour?

Question 1114409: Stu trained for 3 hours yesterday. He ran 15 miles and then biked 44 miles. His biking speed is 7 mph faster than his running speed. What is his running speed in miles per hour?
Answer by ikleyn(52803) (Show Source): You can put this solution on YOUR website!
.

The time equation to find r, the running speed, is


 +  = 3  hours


Solve for r.


I solved it MENTALLY.


The answer is  r = 15 miles per hour.

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