If A alone takes 10 hours to complete a job, and B alone takes 8 hours to complete, A's work efficiency is equal to B's work efficiency.
一项工作甲单独做要10小时完成，乙单独做要8小时完成，甲的工作效率是乙工作效率的多少．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/10) / (1/8)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>