The volume ratio of the cylinder and the cone with the same base area is 3:1, and the height of the cone is 9 cm, what is the height of the cylinder in cm?
底面积相等的圆柱和圆锥的体积比是3：1，圆锥的高是9厘米，那么圆柱的高是多少cm．
<result>9</result>