Think of it this way: the big pond is halved, which means that the big pond is fully opened to drain for 2 hours, and then closed for 2 hours, which is exactly half of the water in the small pond. Because the drainage pipes of large and small pools are the same, it can be concluded that if the small pool is half open, it can be discharged in 6 hours. Then, by comparing the second condition, we can know that the displacement of half open for 2 hours is the same as that of a pipe for 8 hours, so we can know that there are 4 pipes in half, so one * * * has 8 pipes.