A passenger car and a truck leave from A and B in opposite directions at the same time. The bus travels 15 kilometers per hour, and the truck travels 10 kilometers per hour. The two vehicles meet at a distance of 10 kilometers from the midpoint. What is the distance between A and B in kilometers?
一辆客车和一辆货车同时从甲、乙两地相向开出，客车每小时行15千米，货车每小时行10千米，两辆车在距中点10千米处相遇．甲、乙两地相距多少千米．
<gadget id="calculator">15 + 10</gadget>
<output>25</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">25 * 4</gadget>
<output>100</output>

<result>100</result>