A heat engine that operates on a Brayton cycle has a pressure ratio of 5 and uses as its working substance a gas for which the heat capacity ratio \(C_{P} / C_{V}\) is 1. 333 . You wish to replace this engine with one that operates on a Carnot cycle and has the same efficiency as the Brayton engine. If the low-temperature reservoir for the Carnot engine is to be \(15^{\circ} \mathrm{C}\), what must the temperature of the high-temperature reservoir be?