What is a reasonable metric unit for the capacity of a large lake

Can someone me and plz do the problem

Which is the solution to the inequality? 2 3/52 1/15 b< 3 2/15 b> 3 2/15

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