A and B walk towards each other from A and B at the same time, and they meet at a distance of 1200 meters from the midpoint. At this time, how many meters is the distance traveled by the two people:
甲、乙两人同时从A，B两地相向而行，结果在距中点1200米处相遇．此时，两人所行的路程差是多少米：
<gadget id="calculator">1_200 + 1_200</gadget>
<output>2_400</output>

<result>2_400</result>