How Does Angular Velocity Affect Connected Gears?

[the_d]

Homework Statement

Gears A and B are connected by arm AB. The angular velocity at A is 60 rev. per minuter (clockwise), find the angular velocity at B if
a) wAB = 40 rpm (counterclockwise)
b) wAB = 40 rpm (clockwise)

Homework Equations

w=dTheta / dt
w = v/r

The Attempt at a Solution

solved for linear velocity for A (=480) do not know what to do next

 

[berkeman]

Is there a figure that goes with this question? What does it mean to connect two gear sprockets with an arm? Is it a toothed arm and A and B have diffeferent radii?