One of the most efficient engine even developed operates between 1800 K and 600 K, Its actual efficiency is 40%. What percentage of its maximum possible efficiency is this?

Explanation

To find out what percentage of the maximum possible efficiency the actual efficiency of the engine represents, we can follow these steps:

### Step 1: Identify the temperatures
The engine operates between two temperatures:
- Hot reservoir temperature (T1) = 1800 K
- Cold reservoir temperature (T2) = 600 K

### Step 2: Calculate the maximum possible efficiency using the Carnot efficiency formula
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