A 1200 kg car whose transmission is in neutral is coasting down a 10⁰ hill with its brakes used to maintain a constant speed. If the total mass of the car’s iron brake drums is 20 kg, what is the increase in their temperature per 100 m of travel? Assume that the only friction acting occurs in the brakes and that all the heat produced is absorbed by the drums, so the resulting figure is at maximum.