O Points: 0 of 7 A race track 424 m long is built around an area that is a rectangle with a semicircle at each end. Find the length of the side of the rectangle adjacent to the track if the area of the rectangle is to be a maximum. X Maximum Area P= 424 m The length of the side of the rectangle adjacent to the track that maximizes the area is (Type your answer using the appropriate number of significant digits )