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I assume here that the engine operates following a Carnot cycle, which achieves the maximum possible efficiency.
Under this assumption, the efficiency of the engine (so, the efficiency of the Carnot cycle) is given by
where
is the cold temperature
is the hot temperature
For the engine in our problem, the cold temperature is 313 K while the hot temperature is 425 K, so the effiency of the engine is
Under this assumption, the efficiency of the engine (so, the efficiency of the Carnot cycle) is given by
where
For the engine in our problem, the cold temperature is 313 K while the hot temperature is 425 K, so the effiency of the engine is