You have to first find the acceleration from the initial velocity, time and distance and then use the equation for acceleration to find the final velocity. So you just have to remember two things:
A)d=vt+(1/2)at², where d is the total distance traveled, t is the time taken to travel said distance and v is the initial velocity.
B)a=(vf-vi)/t, where again t is total time, a is acceleration and vf and vi are final velocity and initial velocity respectively.
You already have the values of d, t and vi so you all have to do is plug those values into the first formula, solve for a then set the second formula equal to that value of a that you solved for in the first equation. Plug in the values of vi and t that you already have into the formula and then solve for final velocity. If you need help with the calculations let me know and I'll see if I can help.
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