Need math help with the ratio between the perimeter and the breadth of a rectangle

The ratio between the length and the breadth of a rectangular park is 3 :2. If a man cycling along the boundary of the park at the speed of 12km/hr completes one round in 8 minutes, then the area of the park (insq. m) is:The ratio between the perimeter and the breadth of a rectangle is 5 : 1.If the area of the rectangle is 216 sq. cm, what is the length of therectangle?