Uncle Wang surrounded a square vegetable field with a fence of (3/20) kilometers beside a wall. What is the side length of this square vegetable field in kilometers?
王大爷在一堵墙边，用(3/20)千米的篱笆围成了一块正方形菜地，这块正方形菜地的边长是多少千米？
<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) / 3</gadget>
<output>1/20 = around 0.05</output>

<result>1/20 = around 0.05</result>