A reversible engine converts one-sixth o...

A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by `62^@C` , the efficiency of the engine is doubled. The temperatures of the source and sink are

`99^circC`, `37^circC`

`80^circC, 37circC`

`95^circC, `37^circC`

`90^circC`, `37^circC`

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