Find XY in terms of a and b

Empty box + box + empty box fill in the box is equal to 30 how

Which of the following is the shape of a cross section of the figure shown below

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π