To maintain a freezer box at \(-40^{\circ} \mathrm{C}\) on a summer day when the ambient temperature is \(27^{\circ} \mathrm{C}\), heat is removed at the rate of \(1.25 \mathrm{~kW}\). What is the maximum possible coefficient of performance of the freezer, and what is the minimum power that must be supplied to the freezer?