A Carnot engine (E) is working between two temperatures 473K and 273K. In a new system two engines – engine

A Carnot engine E is working between two temperatures 473K and 273K. In a new system two engines – engine E1 works between 473K to 373K and engine E2 works between 373K to 273K. If 12, 1 and 2 are the efficiencies of the engines E, E1 and E2 , respectively, then

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