For a manuscript, A can finish typing in (1/2) hour alone, and B can finish typing in (1/3) hour alone. How many hours will it take for A and B to play together?
一份稿件，甲单独打(1/2)小时打完，乙单独打(1/3)小时打完．现在甲、乙两人合打多少小时打完．
<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>