**First, we must differentiate the following two concepts to avoid confusion:**

- Average speed
- Average velocity

Apparently, this is the same term, but in practice, it is not. Average speed asks you to know what is the general-classical average of the speed at which several drivers were traveling:

**Example:**

- Iván traveled at $70$ km/h.
- Samuel at $80$ km/h.
- Roberto at $120$ km/h

The average speed of all drivers by adding the speeds and dividing by $3 = 90$ km/h.