class is (2/3) hours in total. In this class, we spent (1/5) hours on hands-on operation, (3/10) hours on the teacher's guidance and explanation, and we worked independently in the rest of the time. How many hours did you work on your own?
一堂课共(2/3)小时，在这堂课中我们动手操作用了(1/5)小时，老师引导讲解用了(3/10)小时，其余时间我们自主作业．自主作业用了多少小时？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(2/3) - (1/5) - (3/10)</gadget>
<output>1/6 = around 0.166667</output>

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