A particular car does work at the rate of about 7.0 kJ /s when traveling at a

Question:

A particular car does work at the rate of about 7.0 kJ /s when traveling at a steady 21.8 m/s along a level road. This is the work done against friction. The car can travel 17 km on 1.0 L of gasoline at this speed (about 40 mi/gal). What is the minimum value for TH if TL is 25°C? The energy available from 1.0 L of gas is 3.2 × 107 J.