in the same direction as the displacement vector and the motion
distance is the total length of an object's path. displacement is the overall change in position, ie. how far an object is from its initial position.
the court is 30 m long, so a path going back and forth once is 60 m long. going along this path 6 times totals 360 m.
the end point is the same as the starting point, so the displacement is 0 m.