A project that used to take 6 hours to complete can now be completed in 4 hours, and the work efficiency is much improved compared to the original.
一项工程，原来6小时才能完成，现在只要4小时就可以完成，工作效率比原来提高多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/4) - (1/6)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/12) / (1/6)</gadget>
<output>1/2 = around 0.5</output>

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