If students have difficulty answering the question in the slide, consider discussing an additional situation where 1 student rides a bike around 3 sides of a square city block. Draw a sketch showing the path as she first rides north, then east, then south. If each side of the block is 50 yards long and she takes 20 seconds to ride each side, her total speed is 150 yards in 60 seconds. Compare this to a second student who walks east from the starting point and takes 60 seconds. His speed is 50 yards in 60 seconds.
Then retrace the routes and discuss the velocity. Point out that, for the first student, the velocity when traveling north and south add up to zero, because north and south are in opposite directions. So for the first student, the total, or average velocity, is 50 yards in 60 seconds, east. Because the second student travels in a straight line, his total velocity also equals 50 yards in 60 seconds, east.