A first order reaction is `15%` compelte in 20 minutes. How long it take to be `60%` complete?

Explanation

To solve the problem step by step, we will use the first-order reaction kinetics equation:

**Step 1: Understand the problem**
We know that a first-order reaction is 15% complete in 20 minutes. We need to find out how long it will take for the reaction to be 60% complete.

**Step 2: Use the first-order kinetics equation**
The first-order kinetics equation is given by:
\[ t = \frac{2.303}{k} \log \left( \frac{a}{a - x} \right) \]
...