Illuminated by the rays of the setting sun, Allie rides alone on a merry-go-round, casting a moving shadow on the wall. The merry-go-round is turning 40 degrees per second. As the top view shows, Allie is 20 feet from the center of the merry-go-round, and the sun's rays are perpendicular to the wall. Let N be the point on the wall that is closest to the merry-go-round. What is the approximate speed (feet per second) of Allie's shadow when it passes N? What is the approximate speed of this shadow when it is 10 feet from N?