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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 . 而在時速十公裡的順風而空速計量測到的速度爲三十公裡的狀態下,我們的對地速度將會是時速四十公裡(30+10公裡)。