A conical container filled with water, the water depth is 30 cm, pour all the water into a cylindrical container with the same height as its bottom, what is the depth of the water in cm.
一个盛满水的圆锥形容器，水深30厘米，将水全部倒入和它等底等高的圆柱形容器里，水深多少厘米．
<result>10</result>