In an epicyclic gear train (Fig. 15.40), an arm carries two wheels A and B having 24 and 30 teeth respectively. The arm rotates at 100 rpm in the clockwise direction. Find the speed of the gear B on its own axis, when the gear A is fixed. If instead of being fixed, the wheel A rotates at 200 rpm in the counter clockwise direction, what will be the speed of B? A Arm B Fig.15.40 Epicyclic gear train