Q6.In the figure below there is one larger disccentred in O of radius 10 cm, a smaller disccentred in A of radius 3 cm, and an outer ring of neglectable thicknesscentred in O.

The rod OA is fixed and cannot rotate, but the discs and the ring can rotate freely around theircentres. If the rotation speed of the inner larger disccentred in O is 2500 rpm, find the angular speed of the upper point B which is part of the outer ring, in rad/s.