Question: if efficiency is equal to = 1 - tc / th then tc is yemperature of first reservoir and efficiency must be , n =

if efficiency is equal to =1- tc/th then tc is yemperature of first reservoir and efficiency must be, n =1-1000/t2 but expert have done t1 in denominator, can you please explain this doubt and solve this question again for me by showing which is cold and hot reservoir?
if efficiency is equal to =1- tc/th then tc is yemperature

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