A copper block receives heat from two different sources: 5 kW from a source at 1500 K

Question:

A copper block receives heat from two different sources: 5 kW from a source at 1500 K and 3 kW from a source at 1000 K. It loses heat to atmosphere at 300 K. Assuming the block to be at steady state, determine
(a) The net rate of heat transfer in kW.
(b) The rate of entropy generation in the system's universe. What-if Scenario: What would the entropy generation if the second source were also at 1500 K?