SOLUTION: a student bikes to school averaging 5 mph. he bikes home the exact same distance averaging 10 mph. what is his average speed for the round trip?

Question 854941: a student bikes to school averaging 5 mph. he bikes home the exact same distance averaging 10 mph. what is his average speed for the round trip?
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
If the school was 10 miles from the student's home,
it would take him to bike to school,
and to bike home.
The round trip would be
and it would take .
the average speed would be
(rounded).

The 10 mile distance was made up, but the calculation would be the same with any distance.
We could say, it is miles,
so the times in hours would be and .
The round trip would be miles,
and it would take hours.
Them, the speed (in mph) would be calculated as
.
The distance cancels out, and it was easier to understand and calculate by making .
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