In a gear train, as shown in Fig.15.12, gear B is connected to the input shaft. The arm A carryingthe compound wheels D and E, turns freely on the output shaft. If the input speed is 1200 rpmcounter-clockwise, when seen from the right, determine the speed of the output shaft under thefollowing conditions: (a) when the gear C is fixed and (b) when gear C rotates at 10 rpm counterclockwise.

D -Arm -60 A Output shaft 30 Input shaft 20 B 32 80 Fig.15.12 Bend epicyclic gear train