The Attempt at a Solution
Free body diagram
Setting moment at the origin = 0
(Rb X B) + (Ra X A) + (Rc X C) = 0
solving the 3 determinants and setting the coefficients of i, j, and k to 0, I get:
8Bz - 10 Cy = 0
-12 Az + 10 Cx = 0
12 Ay - 8Bx = 0
I have too many unknowns.
summing forces :
∑Fx = Bx + Cx = 0
∑Fy = Ay + Cy - P = 0 => Ay + Cy = 380
∑Fz = Az + Bz = 0
I still have too many unknowns.