Airport Engineering
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

850 knots
675 knots
75 knots
775 knots

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Airport Engineering
Effective length of a runway is the distance between

Point of intersection of the glide path and the extended plane of the runway surface and the other end of the runway
Point of intersection of the obstruction clearance line and the extended plane of the runway surface, and the other end of the runway
Ends of the runway
Ends of the clear way on either side

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