J7 is right.

There are two equations.

v = vo + at (velocity = initial velocity + acceleration x time). The trick is to only use the 6 seconds that the object accelerates.

x = xo + vot + (1/2) at ^2 (position = initial position + initial velocity x time + one half of accelleration x time squared).

Just keep the units in order, and make sure that she doesn't let the wording of the question confuse her (the t's in the second equation are different from one another). J7 pointed you in the right direction there. Master the units and you'll master physics.

Good luck.