Assuming that the wind speed is a and the flight speed is b when there is no wind, the speed against the wind is b-a, the speed with the wind is b+a, the flight time is t and the flight distance is s.

1, flying with the wind.

S=(b+a)×t .

2. Fly against the wind.

When S=(b-a)×t (when b> is a), the distance is positive.

S = (a-b) × T. (When b

Extended data

Formulas related to forward and backward problems:

1, distance = (water speed+static speed) x downstream time.

2. Distance = (static speed-water speed) x countercurrent time.

3. (windless speed+wind speed) x tailwind time = (windless speed-wind speed) x headwind time = distance.