P, Q, R starts a business with capital in the ratio 1 : 2 : 3 and their investment time periods is in the ratio 3 : 2 : 1. The ratio of their profits is:

3 : 4 : 3

The correct answer is Option (3) → 3 : 4 : 3

$\text{Profit} \propto \text{Capital} \times \text{Time}$

$P: 1 \times 3 = 3$

$Q: 2 \times 2 = 4$

$R: 3 \times 1 = 3$

$\text{Ratio} = 3 : 4 : 3$

$\text{Profit ratio} = 3:4:3$