$3\mathrm{.}114$ Three forces and a couple act on crank ABC. For $P=25N$ and $=40,($a$)$ determine the resultant of the given system of forces, $($b$)$ locate the point where the line of action of the resultant intersects a line drawn through points $B$ and $C,(c)$ locate the point where the line of action of the resultant intersects a line drawn through points A and $B.$