A cylindrical iron block has a base radius of 20 cm and a height of 5 cm. It is cast into a conical iron block with a base area of 314 cm2. Find the height of the cone. (solution with equation)
一个圆柱形铁块的底面半径是20厘米，高是5厘米，把它熔铸成一个底面积是314平方厘米的圆锥形铁块，求圆锥的高．(用方程解答)
<result>60</result>