Cars A and B start from A and B at the same time and drive towards each other, and meet at a distance of 108 kilometers from B. After arriving at the starting point of the other party, they returned to the same place immediately, and met again at a distance of 84 kilometers from point A on the way. What is the distance in kilometers between the two places of encounter?
甲乙两车同时从A、B两地出发相向而行，在距B地108千米处相遇．他们各自到达对方的出发地后立即返回原地，途中又在距A地84千米处相遇．两次相遇地点相距多少千米．
<gadget id="calculator">108 * 3</gadget>
<output>324</output>

<gadget id="calculator">324 - 84 - 108 - 84</gadget>
<output>48</output>

<result>48</result>