Can someone please explain it to me ASAP ??!!! This velocity and net changes

t = 0, a train approaching a station begins decelerating from a speed of 104 mi/hr according to the acceleration function a(t) = - 1664(1 + 8t) - mi/hr2, where t2 0. How far does the train travel between t = 0 0.2? Between t = 0.2 and t = 0.5? . . . . . Between t = 0 and t = 0.2 the train travels mi. Round to three decimal places as needed.)