Theory of Mechanism and Machine I

An epicyclic gear train as shown in figure below, the internal wheels A and F and compound wheel C-D rotate about the axis O. The wheel B and E rotate on pins fixed to arm L. The wheels have the same pitch and the number of teeth are: B and E 18, C 28, and D 26. If the arm L makes 150 rpm clockwise, find the speed of F when (a) the wheel A is fixed (b) the wheel A makes 15 rpm counterclockwise.