SOLUTION: Michael drove to a friend's house at a rate of 40 mph. He returned by the same route at a rate of 45 mph. The driving time for the round trip was 4 hours. What is the distance Mich

Question 208060: Michael drove to a friend's house at a rate of 40 mph. He returned by the same route at a rate of 45 mph. The driving time for the round trip was 4 hours. What is the distance Michael traveled?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Michael drove to a friend's house at a rate of 40 mph. He returned by the same route at a rate of 45 mph. The driving time for the round trip was 4 hours. What is the distance Michael traveled?
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d = rt
t = d/r
4 = d/40 + d/45
1440 = 9d + 8d = 17d
d = 1440/17 miles
d =~ 84.7 miles
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