3. The coordinates of the ends of a runway are (5000, 5000) and (8000, 7000). The co-ordinates of an other runway are (4600, 5100) and (7000, 5300). The co-ordinates of the A.R.P. are
10. The air is blowing at a speed of 75 knots in the direction of the aircraft flying at a ground speed of 775 knots. The air speed of the aircraft, is