To complete the same work alone, A takes 4 days and B takes 5 days, and A's work efficiency is equal to B's work efficiency.
单独完成同一件工作，甲要4天，乙要5天，甲的工效是乙的工效的多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) / (1/5)</gadget>
<output>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>