Velocity Vector

please help.

problem
Block 3 slides along link 2. Q₂A= 3 1/2 in. Q₂F=1 5/8 in.; Q₄G= 1 9/16 in.; GB= 3 in.; FB= 2 in. If the velocity vector of A is 1 1/2 in. long find the velocity vector of B by resolution and composition.

thank you in advance.