197. Consider two Carnot heat engines operating in series. The first engine receives heat from

the reservoir at 2400 K and rejects the waste heat to another reservoir at temperature T. The

second engine receives heat by the first one, convert some of it to work, and rejects the rest to a reservoir at 300 K. If thermal efficiencies of both engines are the same, determine the

temperature T.

A. 849 K B. 578 K

C. 763 K D. 978 K