SOLUTION: Francisco ran for 35 miles an then walked for 6 miles. Francisco runs 4 mph faster than he walks. if it took him 7 hours to finish the race, how fast was he running?

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Question 809370: Francisco ran for 35 miles an then walked for 6 miles. Francisco runs 4 mph faster than he walks. if it took him 7 hours to finish the race, how fast was he running?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
a+b=7,
(r)*a=35,
(w)*b=6,
r=w+4
a = 5, b = 2, r = 7, w = 3