How to get the time delay of a particle?

I have a 2D mesh with a velocity field and I use stream2D function to compute streamlines and interpstreamspeed to compute the vertices from flow speed. Since, all the points are interpolated I would like to find a way to compute the time delay of a particle to go from one point to another over the streamline. If I well understood, the points given by interpflowspeed are iso-time delay spaced. I juste need that delta time.

Thank you very much for your help.

[KSSV]

Cant you make use of Equation of kinematics

d = (vi+vf)/2*t ;

[César]

I thought of that, but I need to locate the points (x,y) of the stream line in my velocity field. And I would like to know if in addition of y(x)=f(x) (points of the streamline), I could get also the values of V.

[KSSV]

Ok..as you have data getting points is not a big deal....