A square steel billet with an edge length of 3 decimeters is forged into a rectangular parallelepiped steel with a cross section of 10 square decimeters. What is the length of this piece of steel?
一块棱长是3分米正方体钢坯，锻造成横截面是10平方分米的长方体钢材．这根钢材的长是多少分米？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">3 * 3 * (3/10)</gadget>
<output>27/10 = around 2.7</output>

<result>27/10 = around 2.7</result>