Both A and B start from A to B at the same time. When A reaches the midpoint C, B travels 800 meters; after A arrives at B, he immediately returns at the original speed. When A reaches point C again, B needs to travel another 200 meters to reach point B. What is the distance between A and B in meters?
甲、乙两人同时从A地出发去B地．当甲到达中点C时，乙行了800米；甲到达B地后，立即按照原来的速度返回．当甲再次到达C点时，乙还需再行200米才能到达B地．那么A、B两地之间的距离是多少米．
<gadget id="calculator">800 * 2</gadget>
<output>1_600</output>

<gadget id="calculator">800 + 1_600 + 200</gadget>
<output>2_600</output>

<result>2_600</result>