It takes (1/2) hour for Mr. Wang to copy a piece of material; it takes (1/3) hour for Mr. Li to copy alone. If Teacher Wang and Teacher Li copy together, how long will it take to finish copying?
抄写一份材料，王老师单独抄要(1/2)小时抄完；李老师单独抄要(1/3)小时抄完．如果王老师和李老师一起抄，多长时间能抄完？
<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 / 5</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>