An engine removes 300 j from a reservoir at 290 k and, Ask an Expert

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An engine removes 300 J from a reservoir at 290 K and exhausts 250 J to a reservoir at 200 K.

(a) What is its efficiency?

(b) How much more work could be done if the engine were reversible?

For (a) i got 16.6%, which is correct, i am having trouble figuring out (b)

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