If A and B work together to process several parts, it takes 5 hours to complete. If A alone takes 10 hours to complete, how much time does B need to do alone?
加工若干个零件，甲乙合作5时完成，如果甲单独做需要10时完成，乙单独做需要多少时．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

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

<gadget id="calculator">1 / (1/10)</gadget>
<output>10</output>

<result>10</result>