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Efficiency of a heat engine whose sink is at a temperature of 300 k is $40 \;\%$. To increase the efficiency to $60 \;\%$, Keeping the sink temperature constant, the source temperature must be increased by

\[(a)\;750\;K \quad (b)\;500\;K \quad (c)\;250\;K \quad (d)\;1000\;K \]

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