Airport Engineering
The air is blowing at a speed of 75 knots in the direction of the aircraft flying at a ground speed of 775 knots. The air speed of the aircraft, is

75 knots
850 knots
675 knots
775 knots

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Airport Engineering
Speed of

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

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