For a pile of yellow sand, car A needs to be transported 15 times, and car B needs to be transported 10 times. If the two vehicles are transported together, how many times can they be transported?
一堆黄沙，甲车要运15次运完，乙车要10次运完，如果两车一齐运，几次可以运完？
<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 / (1/6)</gadget>
<output>6</output>

<result>6</result>