Conservation of Angular Momentum

Mary stands on the edge of a motionless merry-go-round. She jumps off the merry-go-round in a direction tangent to the edge at the speed of 3m/s relative to the ground. If Mary is 30kg, the merry-go-round has the moment of inertia of 300kg/m$^2$, and the radius of the merry-go-round is 2m, what is the resulting angular velocity of this merry-go-round?