61. The sun is moving parallel to the shoreline at a speed of 30 km/h. The ship is 6 km from the shore and passed her lighthouse at noon. (2) Find the function of the distance s between the ship and the lighthouse for the distance d between the ship's trips from noon. That is: Find , which satisfies s = f(d). (b) Find the function of d with respect to time from noon. That is, find f that satisfies d = g(t). (c) Find fg. What does this function mean