Two people, A and B, start from A and B at the same time and walk toward each other. A walks 100 meters per minute and B walks 80 meters per minute. The two met at a distance of 120 meters from the midpoint. What is the distance between A and B?
甲、乙两人分别从A、B两地同时出发相向而行．甲每分钟行100米，乙每分钟行80米．两人在距离中点120米处相遇．A、B两地相距多少米．
<gadget id="calculator">100 + 80</gadget>
<output>180</output>

<gadget id="calculator">100 - 80</gadget>
<output>20</output>

<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">120 * (1/10)</gadget>
<output>12</output>

<gadget id="calculator">180 * 12</gadget>
<output>2_160</output>

<result>2_160</result>