cuboid container with a height of 11 cm contains water of a height of 3 cm, and a cylinder is completely submerged in the water. At this time, the water is just full (not overflowing), and then the cylinder is taken out and submerged in a cone. If the ratio of the radius of the bottom surface of the cylinder to the diameter of the bottom surface of the cone is 1:3, and the height of the cone is less than the height of the cylinder (2/3), then What is the height of the water surface in the cuboid container at this time?
一个长方体容器高11厘米，里面盛有3厘米高的水，将一个圆柱完全放入水中．此时水正好满了(并未溢出)，再将圆柱取出，没入一个圆锥，若圆柱底面半径与圆锥底面直径的比是1：3，圆锥的高比圆柱高少(2/3)，那么此时长方体容器中水面的高度是多少厘米．
<gadget id="calculator">11 - 3</gadget>
<output>8</output>

<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<result>5</result>