9 ABCD is a level playing field. AB = 65 m, BC = 70 m and CA = 110 m. C ˆDA = 70°, DA ˆC = 58° and C is due South of B. (a) Calculate the bearing of A from C. (b) Calculate AD. (c) There are two vertical trees, AX and CY, each of height 17 m, one at each end of the path AC. (i) Calculate the angle of elevation of Y from B. (ii) A bird flies in a straight line from X to Y. It takes 24 seconds. Calculate the average speed of the bird. Give your answer in kilometres per hour.