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Two Carnot heat engines are put in series such that heat rejected by one engine is used in the second engine as heat input. If efficiency of first engine is 30%, and overall combination has efficiency of 65 %, then the efficiency of second engine is M%. Write The value of $\frac{M}{10} .$

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answer is 5.

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Detailed Solution

$1 - η = (1 - η_{1}) (1 - η_{2})$

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