If a conical object with a base radius of 5 cm is immersed in a cylindrical container with a base radius of 15 cm, the water level rises by 1.2 cm. What is the height of the cone?
把底面半径为5厘米的圆锥形物体，浸没在底面半径为15厘米的圆柱形容器中，水面上升了1.2厘米．求圆锥的高是多少？
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