Question: From a work-production perspective, which is more valuable: (a) Thermal energy reservoirs at 675 K and 325 K or (b) Thermal energy reservoirs at 625

From a work-production perspective, which is more valuable:
(a) Thermal energy reservoirs at 675 K and 325 K or
(b) Thermal energy reservoirs at 625 K and 275 K?

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