If rod $CD$ is rotating with an angular velociry $\%$ derermine the angular velocities of rock $AB$ and $BC$ at the instant Siown.

Given:

${}_{DC}=8\frac{\text{r}\text{a}\text{l}}{s},F_{AB}=150mm$

${}_1=45$deg,$F_{BC}=400$mma

${}_2=30$deg,$r_{CD}=200mm$