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A Carnot engine whose low-temperature reservoir is at a temperature of -81.2 ∘C has an efficiency...

A Carnot engine whose low-temperature reservoir is at a temperature of -81.2 ∘C has an efficiency of 38.4 % . An engineer is assigned the problem of increasing this to 43.3 %.

A. By how many degrees must the temperature of the high-temperature reservoir be increased if the temperature of the low-temperature reservoir remains constant? (In Celsius)

B. By how many degrees must the temperature of the low-temperature reservoir be decreased if that of the high-temperature reservoir remains constant? ( in Celsius)

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