One of the most efficient engines ever developed operated between 2100 K and 700 K. Its actualefficiency is 40%. If its efficiency is N/5 fraction of maximum possible efficiency, then N is equal to

One of the most efficient engines ever developed operated between 2100

1.	One of the most efficient engines ever developed operated between 2100 K and 700 K. Its actualefficiency is 40%. If its efficiency is N/5 fraction of maximum possible efficiency, then N is equal to
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