A fuel is burned during a steady-flow combustion process. Heat is lost to the surroundings at 300

Question:

A fuel is burned during a steady-flow combustion process. Heat is lost to the surroundings at 300 K at a rate of 1120 kW. The entropy of the reactants entering per unit time is 17kW/K and that of the products is 15kW/K. The total rate of exergy destruction during this combustion process is
(a) 520 kW
(b) 600 kW
(c) 1120 kW
(d) 340 kW
(e) 739 kW