When the plane is launched between the two cities, it takes 4H to follow the wind and 5h to return against the wind. The speed of the plane in the calm wind is 360km / h, so it is necessary to calculate the speed Wind speed and distance between two cities

Let X be the wind speed and y be the distance
According to the meaning of the title, we can draw a conclusion
y/（360+x）=4
y/（360-x）=5
The solution is x = 40km / h, y = 1600km
Therefore, the wind speed is 40km / h, and the distance between the two cities is 1600km

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