Airport Engineering
A gradient of + 0.08% is followed by a gradient of - 0.07%. If the permissible rate of change of grade is 0.003 per 30 meters, the length of the transition curve, is

175 m
160 m
150 m
140 m

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Airport Engineering
Speed of

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

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