posted by MeganErin .
A runner runs 2.9 km in 9 min and then takes 30 min to walk back to the starting point.
(a) What is the runner's average velocity for the first 9 min?
(b) What is the average velocity for the time spent walking?
(c) What is the average velocity for the whole trip?
(d) What is the average speed for the whole trip?
I will be happy to critique your thinking.