There is a cube glass container with a base circumference of 40 cm. A cuboid metal block with a base length of 5 cm and a width of 2 cm is completely submerged in water. At this time, the water level of the container is 2.5 cm higher than before. How many centimeters is it high?
有一个底面周长是40厘米的正方体玻璃容器，将一个底面长5厘米、宽2厘米的长方体金属块全部浸没在水里，这时容器的水面比原来升高2.5厘米，这块金属块的高是多少厘米？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">2.5 / 10</gadget>
<output>0.25</output>

<gadget id="calculator">4 * 4 * 0.25</gadget>
<output>4</output>

<result>4</result>