Airport Engineering
Runway threshold is indicated by a series of parallel lines starting from a distance of

3 m from runway end
15 m from runway end
10 m from runway end
6 m from runway end

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Airport Engineering
Speed of

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

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