Processing a batch of parts, A alone can complete (1/2) hours, B alone can complete (1/3) hours, how many hours will the two cooperate to complete.
加工一批零件，甲独做(1/2)小时完成，乙独做(1/3)小时完成，两人合作多少小时完成．
<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>