Answer: Dave's average velocity driving home is 0.066667 m/m or 3/45 m/m.
Step-by-step explanation:
Velocity is a vector, meaning it has a direction. Velocity is speed with a direction and its formula is displacement divided by the change in time. This means that whether he was stopping and starting throughout the time or not it doesn't change the velocity.
The first step is to plug in your info:
V=displacement /delta(change)[in] time
Displacement: 3 miles away from his starting point
Change in time: 45 minutes
V=3/45
The second step is to solve:
3/45=0.066667
Your teacher may want 3/45 or 0.066667, both are correct, but make sure you add your unit. The unit in this case is miles every minute or m/m.
Hope this helps;)