The ratio of the base radius of a cylinder to the base radius of a cone is 2:3. The volume of the cone is 1.5 times the volume of the cylinder. The height of the cylinder is 6 cm. What is the height of the cone in cm?
一个圆柱的底面半径与一个圆锥的底面半径的比是2：3，圆锥的体积是圆柱体积的1.5倍，圆柱的高是6厘米，圆锥的高是多少厘米．
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