In a Hooke's joint, the angle between the two shafts is 15°. Find the angles turned by the driving shaft when the velocity of the driven shaft is maximum, minimum and equal to that of the driving shaft. Also, determine when the driven shaft will have the maximum acceleration and retardation. (Max. vel. at o° and 180°; min. at 90° and 270°; equal to 44°30'. 135°30', 224°30' and 315°30'; Max. acc. at 137° and 317°; and Max. ret. at 43° and 223°)