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

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

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Airport Engineering
The capacity of parallel runway pattern depends upon

Weather conditions and navigational aids available
Lateral spacing between two runways and weather conditions
Lateral spacing between two runways, weather conditions and navigational aids available.
Lateral spacing between two runways and navigational aids available

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Airport Engineering
Speed of

All listed here
Sound varies 2.4 kmph per degree centigrade rise in temperature
Sound at 0°C is 1190 kmph
Sound at 0°C is called one Mach

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