You are carrying a tumbler with a surface area of 480.0 cm² filled with coffee (80.0^oC) to campus on a very cold day in February (-15.0^oC). Your tumbler is made out of double-walled aluminum. It has a 0.500 mm thick outer wall of aluminum (k=237.0 W m^-1oC^-1), a 1.00 mm gap of air (k=0.024 W m^-1oC^-1), and a 0.500 mm thick inner wall of aluminum (k=237.0 W m^-1oC^-1). Assume no heat is transferred between you and the tumbler. What is the conductive heat transfer rate from the coffee to the outside air?