Answer
The 600°C-source one.
Work Step by Step
All else held equal, since $\eta_{actual} \propto 1- \frac{T_L}{T_H}$, the one with the higher temperature in the hot reservoir will be more efficient.
Thermodynamics: An Engineering Approach 8th Edition
by Cengel, Yunus; Boles, Michael
Published by
McGraw-Hill Education
ISBN 10:
0-07339-817-9
ISBN 13:
978-0-07339-817-4
Chapter 6 - The Second Law of Thermodynamics - Problems - Page 316: 6-73C
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