Question

"A solid cylinder and a thin-walled hollow cylinder have the same mass and radius. They are rolling horizontally along the ground toward the bottom of an incline. They center of mass of each cylinder has the same translational speed. The cylinders roll up the incline and reach their highest points. Calculate the ratio of the distances (solid/hollow) along the incline through which each center of mass moves."

I already know the answer is 3/4. I just need some help in finding out how to get this solution.