Dora runs one lap around the track, finishing where she started. Clark runs a 100-yard dash along the straight side of the track.Which runner had a greater change in position, start to finish?

Since Dora runs one lap around the track and finishes where she started, her change in position is zero. On the other hand, Clark runs a 100-yard dash in a straight line, so his change in position is greater than zero. Therefore, Clark had a greater change in position, start to finish.