The radii of two right circular cylinders are in the ratio 2 : 3 and their heights are in the ratio 5: 4. Find the ratio of their curved surface areas.

Let r_{1} = 2x, r_{2} = 3x

h_{1} = 5h, h_{2} = 4h

Curved surface area of cylinder = 2πrh

Ratio of Curved Surface Areas =