In the classroom, the students spent (1/5) hours doing experiments, the teacher spent (3/10) hours lecturing, and the rest of the time students did homework independently. It is known that each class is (2/3) hours, and students spent (3/10) hours doing homework how many hours?
课堂上学生做实验用了(1/5)小时，老师讲课用了(3/10)小时，其余时间学生独立做作业，已知每节课是(2/3)小时，学生做作业用了多少小时？
<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>