SOLUTION: a man travels a certain distance at a rate of 75mph and then returns over the same route at 100 mph. What is his average of the roundtrip?

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Question 700760: a man travels a certain distance at a rate of 75mph and then returns over the same route at 100 mph. What is his average of the roundtrip?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
a man travels a certain distance at a rate of 75mph and then returns over the same route at 100 mph. What is his average of the roundtrip?
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RT avg = 2*75*100/(75+100)
=~ 85.714 mi/hr
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Proof is available.