Airport Engineering
The cruising speed of the aircraft is 500 kmph. If there is a head wind of 50 kmph, then the air speed and ground speed of the aircraft respectively will be

500 kmph and 500 kmph
450 kmph and 450 kmph
450 kmph and 500 kmph
500 kmph and 450 kmph

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Airport Engineering
Effective length of a runway is the distance between

Ends of the clear way on either side
Ends of the runway
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

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