The distance between A and B is 360 kilometers. From A to B, it takes 10 hours for a bus and 15 hours for a truck. These two trains depart from A and B at the same time, travel opposite each other, and meet each other how many hours later.
甲、乙两地相距360千米，由甲地到乙地，客车要行10小时，货车要行15小时．这两列车同时从甲、乙两地开出，相对而行，多少小时后相遇．
<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>