A physical education class lasts 40 minutes. It takes (1/12) hours to run, (1/4) hours to practice high jump, and (1/6) hours to play games. The rest of the time is free activities. How much is it used for free activities? Hour?
一节体育课40分钟，跑步用了(1/12)小时，练习跳高用了(1/4)小时，又用了(1/6)小时作游戏，其余时间自由活动，自由活动用了多少小时？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/12) + (1/4) + (1/6)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(2/3) - (1/2)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>