1. The problem statement, all variables and given/known data The exhaust temperature of a Carnot heat engine is 401◦ C. What is the intake temperature if the eﬃciency of the engine is 40.2 %? Answer in units of ◦ C. 2. Relevant equations e = 1 - Tc/Th (all in Kelvin) 3. The attempt at a solution 0.402 = 1 - Tc/ (401+273) = 1 - Tc/674 Tc = 0.598 * 674 = 403.052 Tc in C = 403.052-273 = 130.052 But somehow this answer seems to be wrong on the quest. This is my last problem ..please help? What am I doing wrong? Am I missing something?