Within an insulated system, 418.6 kJ of heat is conducted through a copper rod from a hot

Question:

Within an insulated system, 418.6 kJ of heat is conducted through a copper rod from a hot reservoir at + 200. C to a cold reservoir at + 100.0°C, (The reservoirs are so big that this heat exchange does not change their temperatures appreciably.) What is the net change in entropy of the system, in kJ/K?