There is a cube of iron with a side length of 40 centimeters. Now it is going to be melted and cast into a cuboid with a cross-sectional area of 200 square centimeters. What is the length of this rectangle in centimeters?
有一块棱长是40厘米的正方体铁块，现要把它熔铸成一个横截面积是200平方厘米的长方体，这个长方形的长是多少厘米？
<gadget id="calculator">40 / 200</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 * 40 * (1/5)</gadget>
<output>320</output>

<result>320</result>