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It is known that the speed of the ship in still water is 8km / h. usually, the time ratio of sailing upstream to Sailing downstream is 2:1. One day, it happens to be a rainstorm, and the current speed is twice of the original. This ship travels for 9h. How far is the distance between port a and port B?
Suppose that the distance between port a and port B is SKM, and the water velocity is usually XKM / h. according to the meaning of the question: S8 − X: S8 + x = 21s8 − 2x + S8 + 2x = 9. The solution: S = 20, x = 83. The test: S = 20, x = 83 are the solutions of the equation. Answer: the distance between port a and port B is 20km
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