Two Carnot Engines working in Series Problem

[bortonj88]

I was wondering if anyone would be able to help with this question;

Two carnot engines operate in series between a source 800K and a sink of 290K. The first engine rejects 400kJ to the second engine. If both engines have the same efficiency, calculate;

(i) the temperature for the source of the second engine.
(ii) the heat taken by the first engine from its source.
(iii) the work done by each engine.
(iv) the efficiency if the engines.
(481.7K, 664.4kJ, 264.4kJ, 159.2kJ, 0.398)

Thanks a lot, any help will be greatly appreciated

John

 

[ank_gl]

calculations are right

 

[bortonj88]

thanks but i was actually hoping someone would be able to point me in the right direction to get started...