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

20°
40°
10°
30°

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Airport Engineering
Speed of

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

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