maths~maths~

Two helicopters A and B are flying at constant altitudes of 600m and 800m
respectively.Helicopter A is flying due south and Helicopter B is flying due east.Helicopter A is vertically below Helicopter B. Suppose the speeds of
helicopters A and B are 50m/s and 60m/s respectively.Find after 20 seconds,
(a) the distance between of helicopters A and B
(b)the angle of elecvation of helicopters B from helicopters A
(c)the compass bearing of helicopters B from helicopters A

最好附以圖片作答~