A project alone takes 4 days longer than that of B. Now A and B are working on this project at the same time, and B takes a 2-day break due to something to do in the middle. In this way, it takes 10 days to complete the task. If B does not take a break halfway, how much does it cost A and B to cooperate to complete the project? sky.
一项工程，甲独做比乙多4天，现甲乙同时做这项工程，中途乙因有事休息2天，这样用10天完成任务，若乙中途不休息，甲乙合作完成这项工程用多少天．
<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">4 + 16</gadget>
<output>20</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/16) + (1/20)</gadget>
<output>9/80 = around 0.1125</output>

<gadget id="calculator">1 / (9/80)</gadget>
<output>80/9 = around 8.888889</output>

<result>80/9 = around 8.888889</result>