SOLUTION: johnny walked from home to school at rate of 3mph. he came back home at rate of 5mph. total trip took him 1 hour. how many miles did he walk?

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Question 558503: johnny walked from home to school at rate of 3mph. he came back home at rate of 5mph. total trip took him 1 hour. how many miles did he walk?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
johnny walked from home to school at rate of 3mph. he came back home at rate of 5mph. total trip took him 1 hour. how many miles did he walk?
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The avg speed of a round-trip is
2*3*5/(3+5) = 30/8 mi/hr
= 3.75 mi/hr
3.75*1 = 3.75 miles round trip
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I used the avg speed calculation that I worked out some time ago.
You can accept it, or not.