A heat engine receives heat from two reservoirs: 50 MW from a reservoir at 500 K and

Question:

A heat engine receives heat from two reservoirs: 50 MW from a reservoir at 500 K and 100 MW from a reservoir at 1000 K. If it rejects 90 MW to atmosphere at 300 K,
(a) Determine the thermal efficiency of the engine.
(b) Calculate the entropy generated in kW/K in the engine's universe.