There are three people A, B, and C. A walks 110 meters per minute, B walks 90 meters per minute, and C walks 70 meters per minute. If A starts from A, and B and C start from B, the three start at the same time and walk toward each other. After A and B meet, it takes another 1 minute to reach the midpoint between B and C. What is the distance between A and B in meters?
有甲、乙、丙三人，甲每分钟走110米，乙每分钟走90米，丙每分钟走70米．如果甲从A地，乙和丙从B地，三人同时出发相向而行．甲和乙相遇后，又过了1分钟到达乙和丙的中点．那么A、B两地之间的距离是多少米．
<gadget id="calculator">110 + 90</gadget>
<output>200</output>

<gadget id="calculator">200 * 19</gadget>
<output>3_800</output>

<result>3_800</result>