A reversible engine operating between 500 K and 300 K has the same efficiency as

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A reversible engine operating between 500 K and 300 K has the same efficiency as

A reversible engine operating between 500 K and 300 K has the same efficiency as a reversible engine operating between 400 K and what lower temperature?
A) 200 K
B) 220 K
C) 240 K
D) 260 K
E) 280 K

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