The ratio of the radius of a cylinder to the base of a cone is 2:5, and the ratio of volume is 16:25. If the height of the cylinder is 10 cm, what is the height of the cone in cm
一个圆柱和一个圆锥底面半径的比是2：5，体积的比是16：25．如果圆柱的高是10厘米，那么圆锥的高是多少厘米
<result>7.5</result>