Acceleration And Velocity Problem

[varunKanpur]

I am having a problem in understanding the equation of motions.

The equation of motion are
v=u+at
S=ut +1/2at^2

Velocity= distance/ time=d/t

The problem is that if u=0 then
V=at. Equation.1

S=1/2at^2
V=S/t=1/2at not equal to equation 1

What am I doing wrong??
Thanx

 

[rtsswmdktbmhw]

v = u + a*t gives INSTANTANEOUS velocity at time t.

But, if you use v = s/t you get the AVERAGE velocity.