4. 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 landing and take off of the air craft is made against the direction of wind. In no case the centre line of the runway should make an angle with the wind direction exceeding