A square steel block with a side length of 10 cm is forged into a rectangular parallelepiped steel bar with a side length of 5 cm in cross section. How many centimeters is the length of this steel bar?
把一块棱长为10cm的正方体钢块，锻造成一个横截面边长是5cm的长方体钢条．这根钢条的长是几厘米？
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">10 / 25</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">10 * 10 * (2/5)</gadget>
<output>40</output>

<result>40</result>