A cuboid container is 6cm long, 5cm wide, and 4cm high. A 12 cubic centimeter square iron block is immersed in water. The water does not overflow. How many centimeters does the water surface rise?
一个长方体容器，长6cm，宽5cm，高4cm，将一个12立方厘米的正方铁块浸入水中，水没有溢出来，求水面上升多少厘米？
<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">12 / 30</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>