The efficiency of a heat engine is \( 1 / 6 \). When the temperature of sink is decreased by \( ...

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The efficiency of a heat engine is \( 1 / 6 \). When the temperature of sink is decreased by \( 62^{\circ} \mathrm{C} \), its efficiency doubled. Then, what is the temperature of source?
(a) \( 470^{\circ} \mathrm{C} \)
(b) \( 372^{\circ} \mathrm{C} \)
(c) \( 542^{\circ} \mathrm{C} \)
(d) \( 1042^{\circ} \mathrm{C} \)
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