Finding the average velocity for this problem

[ixerr]

Homework Statement

Larry leaves home at 9:01 and runs at constant speed 400.0 yards due west to a lamppost. He reaches the lamppost at 9:06, immediately turns and runs due east 1000.0 yards to a tree. Larry arrives at the tree at 9:11. What is Larry's average velocity (in yd/min) for the entire run?

Homework Equations

The Attempt at a Solution

 

[Spinnor]

Note the difference between average speed and average velocity in the following:

http://www.worsleyschool.net/science/files/average/velocity.html