A pile of goods can be transported by car A alone in 4 hours, and car B by itself in 6 hours. Now there are two vehicles A and B jointly transporting this pile of goods (5/6), how many hours will it take?
一堆货物，甲车独运4小时运完，乙车独运6小时运完．现在有甲、乙两车合运这堆货物的(5/6)，需要多少小时？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/4) + (1/6)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(5/6) / (5/12)</gadget>
<output>2</output>

<result>2</result>