An engine delivers 100 lb·ft of torque. In low gear the total reduction from engine to rear wheels is 12 : 1 and the wheel (rolling) radius is 1 ft; ignore friction losses. Find the forward push of the tyres on the road (answers in lb): (a) with 12 : 1 and 1 ft radius; (b) if the reduction were 8 : 1 with the same wheel; (c) with 12 : 1 if the wheel radius were 18 in (1.5 ft).