An empty cuboid container A has a length of 40 cm and a width of 25 cm. The length of another cuboid container B is 30cm, the width is 20cm, and the water depth is 20cm. Now pour part of the water in B to A so that the height of the water in the two containers is the same. How many centimeters is the water depth at this time?
一个空的长方体容器A的长是40cm，宽是25cm．另一个长方体容器B的长是30cm、宽是20cm、水深20cm，现要将B的水倒一部分给A，使两容器中水的高度相同，这时水深多少厘米？
<gadget id="calculator">30 * 20 * 20</gadget>
<output>12_000</output>

<gadget id="calculator">40 * 25</gadget>
<output>1_000</output>

<gadget id="calculator">30 * 20</gadget>
<output>600</output>

<gadget id="calculator">1_000 + 600</gadget>
<output>1_600</output>

<gadget id="calculator">12_000 / 1_600</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>