Road. Has been repaired (1/3). Exactly 4 kilometers have been repaired. How long is this road in kilometers?
一条路．已经修了(1/3)．正好修了4千米．这条路全长多少千米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">4 / (1/3)</gadget>
<output>12</output>

<result>12</result>