Which one's better?

Heat engines are cyclic devices which produce work by exchanging heat with two thermal reservoirs. Thermal reservoirs are bodies having high heat capacity, so even when they gain or lose heat their temperature remains constant.

There are two heat engines A and B.

A works between two thermal reservoirs having temperatures $${ T }_{ H }=600K$$, $${ T }_{ L }=300K$$.

B works between two thermal reservoirs having temperatures $${ T }_{ H }=1000K$$, $${ T }_{ L }=400K$$ .

Subscripts $$H$$ and $$L$$ indicate high temperature reservoir and low temperature reservoir respectively.

It was found out that both heat engines, when working, have the same thermal efficiency of $$30$$%. Thermal efficiency of a heat engine is the ratio of work output to the heat input.

You are an engineer and you have been sent by your company to review the performances of the two heat engines and replace only that heat engine which is working poorly out of the two. What do you report to your superiors?

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