It takes 10 hours for A to complete a job and 15 hours for B. How much more efficient is A than B?
完成一项工作，甲需10小时，乙需15小时，甲的工作效率比乙的工作效率高多少
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/10) - (1/15)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/30) / (1/15)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>