Question

It takes Serina .5h to walk to school. Her route is 15km long. What is
her average speed?

Answer 1

Answer: 3km/h

Explanation:

15km per 5h, which is 3km per 1h. This is pretty easy. I don't know what you want for her average speed like in unit (e.g 1 hour). If you are asking for the hour unit it is 3km/h