I'm having a hard time setting up an equation for a heat engine problem with one heat source and two heat sinks given only the temperature of the heat source and temperature of the two heat sinks as: TH = 1000 K TC1 = 200 K TC2 = 300 K It is given that the two heat rejected are of equal value. determine the maximum thermal efficiency. 2. Relevant equations thermal efficiency (carnot) = 1 - TC/TH = 1 - QC/QH 3. The attempt at a solution Since there was two heat sinks with an equal value of heat rejected at each: QC1 = QC2 = QC therefore, QH = QC1 + QC2 will turn into QH = 2QC I took the entropy balance equation to solve for QC: 0 = QH/1000 - QC/200 - QC/300 but I don't have a constant on the other side to figure out for QC to plug back in to find QH and then solve for thermal efficiency. any help please?