On a long road trip you are driving along a straight position of Route 188. Suppose that t hours after entering. Nevada your distance from the donut hole is s(t) = -10t^2 - 40t + 120 miles
a) How long will it take you to reach the Donut Hole after entering Nevada
b) Find your velocity v(t) as you drive toward the Donut hole
c) Are you accelerating or decelerating as you approach the Donut Hole? At what rate?