A project alone takes 5 hours, and B's work efficiency is 5/6 of A's. If A and B work together, how many hours can it be completed?
一项工程，甲独做需5小时，乙的工作效率是甲的(5/6)，甲乙两人合做，几小时可以完成？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(1/5) * (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/5) + (1/6)</gadget>
<output>11/30 = around 0.366667</output>

<gadget id="calculator">1 / (11/30)</gadget>
<output>30/11 = around 2.727273</output>

<result>30/11 = around 2.727273</result>