It takes (1/2) hours for A to do a job alone, and (1/3) hours for B to do it alone. If A and B cooperate to complete half of the work, how many hours will it take?
一项工作，甲单独做需要(1/2)小时，乙单独做需要(1/3)小时，若甲乙合作完成工作的一半需要几小时、
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / (1/2)</gadget>
<output>2</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">(1/2) / 5</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>