$$\triangle PQR$$ is right-angled at Q. The length of PQ is 5 cm and $$\angle PRQ = 30^\circ$$. Determine the length of side QR.

A

$$5\sqrt{3}$$ cm

B

$$3\sqrt{3}$$ cm

C

$$\frac{1}{\sqrt{3}}$$ cm

D

$$\frac{5}{\sqrt{3}}$$ cm