A cuboid steel with a length of 3 meters is cut into two sections along the cross section, and the surface area increases by 0.6 square decimeters. What is the volume of this section of steel in cubic decimeters?
一根长3米的长方体钢材，沿横截面截成两段后，表面积增加了0.6平方分米，这段钢材的体积是多少立方分米．
<gadget id="calculator">0.6 / 2</gadget>
<output>0.3</output>

<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">0.3 * 30</gadget>
<output>9</output>

<result>9</result>