Targ S.M. 1988 C1 option 16

The rigid frame is fixed at the point A by a hinge, and at the point B it is attached either to the weightless rod BB₁, or to the hinged support on the rollers; the rod is attached to the frame and to the fixed support by the hinges. A pair of forces act on the frame with the moment M = 100N · m and two forces. Determine the reaction of bonds in points A and B. In the final calculations take l = 0.5 m.
Given: E: α₂ = 30⁰; F₂ = 20H; K: α₄ = 45⁰; F₄ = 40H;