Put a conical lead block with a height of 24 cm into a cylindrical container filled with water with a bottom radius of 30 cm. At this time, the water in the container just submerges the lead block, and the water level rises by 2 cm. The conical lead block What is the radius of the base in centimeters?
把一个高为24厘米的圆锥形铅块放进底面半径为30厘米的装有水的圆柱形容器中，这时容器中的水正好淹没铅块，水面上升了2厘米，这个圆锥形铅块底面半径是多少厘米？
<result>7.5</result>