Lao Ting and Lao Zhang set off for a walk back and forth between A and B at the same time. The two met for the first time at a distance of 800 meters from A. After the meeting, the two continued to move forward. The two met for the second time at a distance of 200 meters from A. How many meters is the distance between A and B?
老孪和老张在A、B已两地间同时相向出发往返而行散步．在离A地800米处时两人第一次相遇，相遇后两人继续前进，在离A200米处时两人第二次相遇，求A、B两地相距有多少米？
<gadget id="calculator">800 * 3</gadget>
<output>2_400</output>

<gadget id="calculator">2_400 + 200</gadget>
<output>2_600</output>

<gadget id="calculator">2_600 / 2</gadget>
<output>1_300</output>

<result>1_300</result>