A project is completed alone, it takes 40 days for team A and 50 days for team B, how much more efficient is team A than team B?
一项工程单独完成，甲队要40天，乙队要50天，甲队工作效率比乙队高多少．
<gadget id="calculator">1 / 40</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1 / 50</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">(1/40) - (1/50)</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">(1/200) / (1/40)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>