In one dimension, the average velocity is simply the change in position over the change in time: So, for a race like this you can calculate a different average velocity depending on the time interval.

Calculating average velocity is just a matter of identifying two time values and two position values and then performing two subtractions and a division. It is not complicated. Doing this several ...

Ok, I want to calculate average speed. For this case, let me pretend that I am going all in one direction. So the problem would be that I travel 20 mph for 2 miles and then 10 mph for 2 miles.