The net loss of available energy as a result of this heat transfer is

Question

1000 kJ/s of heat is transferred from a constant temperature heat reservoir maintained at 1000 K to a system at a constant temperature of 500 K.  The temperature of the surroundings is 300 K.  The net loss of available energy as a result of this heat transfer is                                                           

(a)  450 kJ/s          (b)  400 kJ/s   

(c) 350 kJ/s           (d) 300 kJ/s