A cuboid container, measured from the inside, is 2dm in length and width. Pour 5.6L of water into the container, and then put a stone into the water. At this time, the water depth in the container is measured to be 1.5dm. What is the volume of the stone? cubic decimeter?
一个长方体容器，从里面量长、宽均为2dm，向容器中倒入5.6L水，再把一块石头放入水中，这时量得容器内的水深是1.5dm，这块石头的体积是多少立方分米？
<gadget id="calculator">2 * 2 * 1.5</gadget>
<output>6</output>

<gadget id="calculator">6 - 5.6</gadget>
<output>0.4</output>

<result>0.4</result>