[math] Calculate velocity

I honestly feel so stupid asking this, I know the usual formula which is v = d/t.

However I do not have or know how to calculate the time.

I have an object that moves towards the mouse cursor and uses this formula to smooth its way across the screen:

		getBounds().x += (pos.x - getBounds().x) * 0.05f;

I can get the distance needed to travel by doing:

d = Math.abs(getBounds().x - pos.x)

How would I get the speed of the object with this information?