It takes 8 days for A to complete a job alone, and B's work efficiency is half of A's. Two people cooperate at the same time, how many days can complete this work?
一件工作，甲单独完成需要8天，乙的工效是甲的一半．两人同时合作，几天能完成这件工作？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) / 2</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">(1/8) + (1/16)</gadget>
<output>3/16 = around 0.1875</output>

<gadget id="calculator">1 / (3/16)</gadget>
<output>16/3 = around 5.333333</output>

<result>16/3 = around 5.333333</result>