In a cuboid water tank with a length of 120 cm and a width of 60 cm, after putting a cuboid iron block, the water level will rise by 2 cm compared to the original. Given that the length and width of the iron block are both 20 cm, find the height of the iron block.
在一个长120厘米、宽60厘米的长方体水箱里，放入一块长方体的铁块后，水面就比原来上升2厘米．已知铁块的长和宽都是20厘米，求铁块的高．
<gadget id="calculator">120 * 60 * 2</gadget>
<output>14_400</output>

<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<gadget id="calculator">14_400 / 400</gadget>
<output>36</output>

<result>36</result>