Master Li processes 1080 parts, and he completes (1/8) of all parts in (9/4) hours. How many hours does it take to complete all processing tasks?
李师傅加工1080个零件，他用(9/4)小时完成了全部零件的(1/8)，完成全部加工任务需要多少小时？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">9 / 4</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">(1/8) / (9/4)</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">1 / (1/18)</gadget>
<output>18</output>

<result>18</result>