Additional question: Two people, A and B, travel southward from North Village and South Village at the same time. A rides a bicycle and travels 16 kilometers per hour, and B walks 6 kilometers per hour. After 2 hours, A catches up with B. Find the two villages in the north and the south distance?
附加题：甲、乙两人分别从北村和南村同时向南而行，甲骑自行车每小时行16千米，乙步行每小时行6千米，2小时后甲追上乙，求南北两村的路程？
<gadget id="calculator">16 - 6</gadget>
<output>10</output>

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

<result>20</result>