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Perseverence

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## Homework Statement

A motorcycle goes up a hill at a constant speed of 10 miles per hour and comes down at the speed of 25 miles per hour what is the average speed for the entire duration?

## Homework Equations

Vavg =(vf-vi)÷2

## The Attempt at a Solution

It seems very straightforward that this would be 25 - 10 / 2. Making the average speed 7.5 miles per hour. But that is not the answer given in the solution. Is the solution set wrong? Thank you for your help. This is making me crazy.