Average speed = total distance ÷ total time
Use the same units for all distances and times
Add all distances traveled
Add all time intervals taken
Divide total distance by total time
For equal distances at different speeds, use average speed = 2v1v2 ÷ (v1 + v2)
For unequal segments, use average speed = (d1 + d2 + … ) ÷ (t1 + t2 + … )