Probability — practice question

Particles $P$ and $Q$ have masses $0.8\,\text{kg}$ and $0.4\,\text{kg}$ respectively. $P$ is connected to a fixed point $A$ by a light inextensible string, and this string is inclined at an angle $\alpha$ to the vertical. $Q$ is connected to a fixed point $B$, vertically below $A$, by a light inextensible string of length $0.3\,\text{m}$. The string $BQ$ is horizontal. $P$ and $Q$ are linked to each other by a light inextensible string which is vertical. The particles move in horizontal circles of radius $0.3\,\text{m}$ about the axis through $A$ and $B$ with constant angular speed $5\,\text{rad s}^{-1}$ (see diagram).