Airport Engineering
The landing and takeoff of the air craft is made against the direction of wind. In no case the centre line of the runway should make an angle with the wind direction exceeding

30°
20°
10°
40°

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Airport Engineering
Speed of

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

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