A closed system operating at steady state receives 5000 kW of heat from a source at 1500

Question:

A closed system operating at steady state receives 5000 kW of heat from a source at 1500 K, produces 2000 kW of useful power and rejects the remaining heat into the atmosphere. Determine the rate at which energy
(a) Enters and
(b) Leaves the system. Assume the atmospheric temperature to be 300 K.