Initial Velocity = 0

Acceleration = 1

Distance = 3

Find the time taken to cover that distance.

So generally I would use the second equation of motion to get an answer

t=2.45s

But why don't I get the same answer when I try to solve it in this way...

\(\displaystyle a=\frac{v}{t}\) and \(\displaystyle v=\frac{d}{t}\)

Thus,

\(\displaystyle a=\frac{d}{t}/t\)

\(\displaystyle a=\frac{d}{t^2}\)

\(\displaystyle 1=\frac{3}{t^2}\)

\(\displaystyle t=1.73s\)

What am I doing wrong? Why don't the answers match?