Consider an airplane flying at a steady and level flight with a speed of 144 knots and an altitude of 13,000 ft. At time t = 0 hour, the position of the airplane is directly above an island. (a) Express the horizontal distance d in feet that the airplane has flown after t=0 as a function of time in hours. (1 knot 1.688 ft/s). Ans: d(t) = (b) Express the distances in feet between the airplane and the island as a function of d. Ans: s(d) = (c) Find s (d (3)). Round your answer to the nearest foot. Ans: (c) Explain the physical meaning of the composite function s(d(t)). Ans: ft. ft. ft.