A pool can be filled with water from pipes A and B. It takes 12 hours to fill the pool with pipe A alone, and 24 hours to fill the pool with pipe B alone. Now it is required to fill the pool in 10 hours, and the time for pipes A and B to be put together is as short as possible, so how many hours is the minimum time for pipes A and B to be put together?
某水池可以用甲、乙两个水管注水，单放甲管注满水池需12小时，单放乙管注满水池需24小时．现在要求10小时注满水池，并且甲、乙两管合放的时间尽可能地少，那么甲、乙管合放最少需要多少小时？
<result>4</result>