It used to take 18 minutes for Xiao Wang to process a part, but it only took 6 minutes to process a part later, how much the work efficiency has improved compared with the original
小王原来加工一个零件要18分钟，后来加工一个零件只要6分钟，工作效率比原来提高了多少
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 18</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">(1/6) - (1/18)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/9) / (1/18)</gadget>
<output>2</output>

<result>2</result>