It takes A 9 days and B 10 days to complete a job, how many times the work efficiency of A is that of B.
完成一件工作，甲用9天，乙用10天，甲的工效是乙的工效的多少倍．
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/9) / (1/10)</gadget>
<output>10/9 = around 1.111111</output>

<result>10/9 = around 1.111111</result>