A conical container has a bottom area of 30 square centimeters and a height of 40 cm. After filling it with water, it is poured into a cube container with a side length of 10 cm. What is the height of the water in cm?
一个圆锥形容器，底面积是30平方厘米，高是40厘米，把它装满水后，再全部倒入一个棱长是10厘米的正方体容器里，水高多少厘米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/3) * 30 * (2/5)</gadget>
<output>4</output>

<result>4</result>