Engine A receives three times more input heat, produces five times more work, and rejects two times more heat than engine B. The efficiency of engine A is

For A, 3Q, 5W and 3Q-5W are heat absorbed, work done and heat rejected respectively and for B. Q, W, Q–W are the corresponding values for A. Equate (3Q-5W) to 2×(Q-W)⇒ Q = 3W