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Two carnot engines A and B are operated ...

Two carnot engines A and B are operated in series .Engine A receives heat from a reservoier at 600 K and rejectrs heat to a reservoir at temperatures T. Engine B receives heat rejected by engine A and in turn rejects it to a reservoir at 100 K .If the efficiencies of the two engines A and B are represented by `eta_(A) and eta_(B)` repectively then what is the value of `(eta_(B))/(eta_(A))`?

A

`5/12`

B

`12/5`

C

`12/7`

D

`7/12`

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