A sport utility vehicle with a thermal efficiency (th) of 20% produces 250 hp of engine output

Question:

A sport utility vehicle with a thermal efficiency (ηth) of 20% produces 250 hp of engine output while traveling at a velocity of 80 mph.
(a) Determine the rate of fuel consumption in kg/s if the heating value of the fuel is 43 MJ/kg.
(b) If the density of the fuel is 800 kg/m3, determine the fuel mileage of the vehicle in the unit of miles/gallon.