A square steel billet with a side length of 0.9 meters is forged into a rectangular parallelepiped steel with a cross section of 0.18 square meters. How long is the forged steel in meters?
把一棱长为0.9米的正方体钢坯，锻造成横截面是0.18平方米的长方体钢材．锻造成的钢材长多少米．
<gadget id="calculator">0.9 / 0.18</gadget>
<output>5</output>

<gadget id="calculator">0.9 * 0.9 * 5</gadget>
<output>4.05</output>

<result>4.05</result>