Need help understanding this Aerodynamics Question

[whyme]

Homework Statement

In the three-dimensional flow from a point source, the streamlines radiate in all directions from a point. If we designate the strength of the course as

• Λ' show that |V|=
  • Λ'/4*Pi*r^2

So I've been trying to read the text and understand what this asking/how to solve but I really don't understand the wording.

 

[whyme]

To my understanding I need to use relate this to the equation of the divergence of velocity
div V = ∂u/∂x + ∂v/∂y + ∂w/∂z, but other than that I'm not sure if I'm going in the right direction or not