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Mathematical problems and solutions of downwind and headwind of aircraft
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solve

Assume that the windless speed of the aircraft is xkm/h.

(X+20)*3=(X-20)*4.5

3X+60=4.5X-90

- 1.5X=- 150

X= 100

Distance between two airports = (100+20) * 3 = 360km.

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