There is a cuboid container with a length of 5 decimeters, a width of 4 decimeters, and a height of 3 decimeters. The container is filled with water and immersed in a rectangular cuboid iron block whose bottom side is 2 decimeters long. When the iron block is removed from the water, When it was taken out, the water level in the bucket dropped by 5 centimeters. How many decimeters is the height of this cuboid iron block?
有一个长5分米、宽4分米、高3分米的长方体容器，容器内盛满了水，并浸有一块底面边长为2分米的正方形的长方体铁块，当铁块从水中取出时，桶内的水面下降了5厘米，这块长方体铁块的高是多少分米？
<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">(1/2) / 4</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">5 * 4 * (1/8)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>