The efficiency of a camot's engine is 2/5. When the temperature of the source is increased by `20 ^(@)C` then its efficiency is found to increase to 9/20. Calculate the temperature of source and sink.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Understand the efficiency formula for a Carnot engine
The efficiency (η) of a Carnot engine is given by the formula:
\[ η = 1 - \frac{T_2}{T_1} \]
where \(T_1\) is the temperature of the source and \(T_2\) is the temperature of the sink.
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