Xiaofang spends (3/10) hours doing Chinese homework, (1/5) hours doing math homework, and (1/6) hour doing English homework. How many hours did Xiaofang spend doing these three kinds of homework?
小芳做语文作业用(3/10)小时，做数学作业用(1/5)小时，做英语作业用(1/6)小时．小芳做这三种作业一共用了多少小时？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

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

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

<gadget id="calculator">(3/10) + (1/5) + (1/6)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>