Two Carnot engines are connected in a series with working extreme temperatures as 2000 K and 200 K respectively. What is the efficiency of the first Carnot engine (in %)?

Two Carnot engines are connected in a series with working extreme temp

1.	Two Carnot engines are connected in a series with working extreme temperatures as 2000 K and 200 K respectively. What is the efficiency of the first Carnot engine (in %)?
A.	45
B.	50
C.	68
D.	90
Answer» B. 50