The water inlet pipe and the water outlet pipe are opened at the same time, and the pool can be filled in x hours.
Because the water inlet pipe is opened separately, the whole pool can be filled in 6 hours.
So, just open the water inlet pipe, 1 hour can fill the whole pool 1/6.
Therefore, X/6 water can be injected only by opening the water inlet pipe for X hours.
Similarly, because the water pipes are opened separately, it takes 8 hours.
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Therefore, opening the water pipe 1/8 hours alone can release 1/8 of the whole pool.
Therefore, when the water pipe is opened for x hours alone, X/8 of water can be discharged.
Therefore, the equation can be obtained:
X/6-X/8= 1
The solution is x = 24.
Answer: Open the inlet pipe and outlet pipe at the same time, so that the pool can be filled in 24 hours.
For reference! JSWYC