The length, width and height of a cuboid container measured from the inside are 5dm, 3dm, and 8dm respectively, and water is poured into the container. When the water in the container forms a square on the opposite side for the second time, what is the volume of the water in dm**3.
一个长方体容器从里面量得长、宽、高分别是5dm、3dm、8dm，向容器注水，当容器的水第二次形成相对面正方形时，水的体积多少dm**3．
<gadget id="calculator">5 * 5 * 3</gadget>
<output>75</output>

<result>75</result>