SOLUTION: Michael drove to a friend's house at a rate of 40 mi/h. He returned by the same route at a rate of 45 mi/h. The driving time for the round trip was 4 hours. What is the distance Mi
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Question 643831: Michael drove to a friend's house at a rate of 40 mi/h. He returned by the same route at a rate of 45 mi/h. 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 mi/h. He returned by the same route at a rate of 45 mi/h. The driving time for the round trip was 4 hours. What is the distance Michael traveled?
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The avg speed of the round trip is
2*40*45/(40+45) = 720/17 mi/hr (I can prove that if needed)
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d = r*t = (720/17)*4 = 2880/17 miles RT
