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If a 10 km/h tail wind exists, flying speed will be 30 km/h as measured by an airspeed indicator, while groundspeed will be 30+10 = 40 km/h . 而在时速十公里的顺风而空速计量测到的速度为三十公里的状态下，我们的对地速度将会是时速四十公里（30+10公里）。