For a batch of goods, it takes 10 hours for car A to transport alone, and it takes 15 hours for car B to finish transporting alone. How many hours will it take for two vehicles A and B to transport half of the goods at the same time?
一批货，甲车独运要10小时，乙独运要15小时运完．甲乙两车同时运这批货物的一半，需要几小时？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">1 / 15</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">(1/2) / (1/6)</gadget>
<output>3</output>

<result>3</result>