s a gasoline engine is running, an amount of gasoline containing 16,500 J of chemical potential energy is burned in 1 s. During that second, the engine does 3,300 J of work.

The burning gasoline has a temperature of about 4,800F (2,900 K). The waste heat from the engine flows into air at about 86F (303 K). What is the Carnot efficiency (in percent) of a heat engine operating between these two temperatures?