It takes 8 days for A to complete a task alone, and 12 days for B to complete it alone. How much faster is A's work efficiency than B?
完成一项工作，甲独做完要8天，乙独做完要12天完成，甲的工作效率比乙快多少
<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) / (1/12)</gadget>
<output>1/2 = around 0.5</output>

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