A job can be done alone in 10 hours, and B alone can complete 1/3 of the job in 5 hours. After 5 hours, A and B cooperate to complete the remaining work. How many hours will it be completed?
一件工作甲单独做10小时完成，乙单独做5小时完成这件工作的(1/3)，乙做5小时后，剩下的工作甲乙合作，几小时完成？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(1/3) / 5</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/10) + (1/15)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(2/3) / (1/6)</gadget>
<output>4</output>

<result>4</result>