SOLUTION: A man traveled a certain distance at the rate of 15 miles an hour and came back at the rate of 10 miles an hour. What is his average speed ?

Question 509145: A man traveled a certain distance at the rate of 15 miles an hour and came back at the rate of 10
miles an hour. What is his average speed ?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
A man traveled a certain distance at the rate of 15 miles an hour and came back at the rate of 10
miles an hour. What is his average speed ?
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You can work this out, or take my word for it.
Avg = 2*15*10/(15+10) = 300/25
Avg = 12 mi/hr
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Notice it's less than the average of the 2 speeds, because more time is spent at the lower speed.

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