Let v be the speed of the solid sphere at the bottom of incline.
Applying principle of conservation energy.
1/2 mv2 + 1/2 Iω2 = mgh
As I = 2/5 mR2;
As h is same in both the case v must be same, i.e., it will reach the bottom with the same speed for both the inclination. Time taken to roll down both the inclinations would be also the same, as their heights are equal.