Question: Two Carnot heat engines are operating in series such that the heat sink of the first engine serves as the heat source of the second

Two Carnot heat engines are operating in series such that the heat sink of the first engine serves as the heat source of the second one. If the source temperature of the first engine is 1600 K and the sink temperature of the second engine is 300 K and the thermal efficiencies of both engines are the same, the temperature of the intermediate reservoir is
(a) 950 K
(b) 693 K
(c) 860 K
(d) 473 K
(e) 758 K

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