A project is completed in 5 days alone, and B is completed in 8 days alone. The work efficiency of B is much lower than that of A.
一工程甲单独做5天完成，乙单独做8天完成，乙的工效比甲的工效低多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/5) - (1/8)</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">(3/40) / (1/5)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>