A project alone takes 8 hours, and B alone takes 12 hours. When the project is completed jointly, B will do much less than A.
一项工程，甲独做要8小时，乙独做要12小时，合作完成这项工程时，乙比甲少做多少．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/8) - (1/12)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">(1/24) / (1/8)</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>