A Carnot engine uses hot and cold reservoirs that have temperatures of 1850 and 845 K, respectively. The input heat for this engine is QH. The work delivered by the engine is used to operate a Carnot heat pump. The pump removes heat from the 845-K reservoir and puts it into a hot reservoir at a temperature T'. The amount of heat removed from the 845-K reservoir is also QH. Find the temperature T' in kelvins.