Thermodynamics Second Law of Thermodynamics and Entropy Carnot's Theorem and its Corollary

A Carnot engine operates between temperature 1000 K and 400 K. The heat rejected by the first Carnot engine is used by the second Carnot engine, whose sink temperature is 200 K. If the heat absorbed by the first Carnot engine is 200 MJ. What is the heat rejected (in MJ) by the second Carnot engine?

1
40
2
50
3
60
4
70

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