# How do I find average velocity over a given time interval?

##### 1 Answer

May 17, 2015

Average velocity = **total** distance / **total** time

**Example:**

I travel from Rotterdam to Amsterdam (100 km) with an average speed of 80 km/h and return with an average speed of 120 km/h.

Then my average verlocity is **NOT** 100 km/h, but:

Time for the trip out:

Time for the trip back:

Total time:

Average velocity:

This may be counter-intuitive, but remember you spend more time in the slow mode than in the fast mode.