Airport Engineering
The capacity of parallel runway pattern depends upon

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

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Airport Engineering
Speed of

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

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