After a cuboid container (3 meters long, 2 meters wide, and 1 meter high) is filled with water, a rock is put into it and completely submerged in the water. After the rock is taken out, the water level drops by 0.4 meters. What is the volume of the rock in cubic meters? ?
一个长方体的容器(长3米、宽2米、高1米)盛满水后，放入一块岩石完全浸没在水中，取出岩石后，水面下降了0.4米，这块岩石的体积是多少立方米？
<gadget id="calculator">3 * 2 * 0.4</gadget>
<output>2.4</output>

<result>2.4</result>