Calculate the speed in metres per second of the belts driving the following pieces of equipment (you may ignore belt thickness): (a) a cotton-carding engine driven at 165 rev/min by a pulley of diameter 45 cm; (d) a power loom driven at 200 rev/min by a pulley of diameter 25 cm; ( c) a seamless-hosiery machine driven at 240 rev/min by a pulley of diameter 18 cm; and (d) a shaft-drive motor, operating through a pulley of diameter 15 cm at 1750 rev/min