v = [tex]\frac{d}{t}[/tex]
and
a = [tex]\frac{v}{t}[/tex]
We have acceleration and velocity so:
3 = [tex]\frac{v}{t}[/tex]
88.3 = [tex]\frac{d}{t}[/tex]
In the acceleration equation we can isolate for v and then plug it back into the other equation to solve...
So...
[tex]3t = v[/tex]
[tex]88.3 = 3t[/tex]
Divide by three and
t = 29.4 s