FIGURE P$11-1$

$11-42.$ The combined pulley shown in Figure P$11-42$ has two cables wound around it at different diameters and fastened to point $C$ and block E$,$ respectively. If the velocity of block E is $240m\frac{m}{s}$ downward, determine $($a$)$ the angular velocity of $D,($b$)$ the velocity of point $C,($c$)$ the angular velocity of lever AC$,$ and $($d$)$ the velocity of point A$,$ at the instant shown.

FIGURE P$1$