Question

solid and hollow sphere rolling on inclined plane ratio of velocities

Answer 1

the ratio b/w them is 1:2
solid:hollow

Answer 2

The velocities of the hollow and solid sphere that are rolling down on the inclined plane will be V hollow/Vsolid.

You need to calculate the answer as per the masses are given by the ball.

Also, you need to assume that the balls never slipped down the surface since then the velocities can differ.