A and B start from two points A and B at the same time. A travels 80 meters per minute, and B travels 60 meters per minute. After starting for a while, the two meet at point C from the midpoint; if A is on the way after departure After staying in a certain place for 7 minutes, the two will meet at D from the midpoint, and the distance from the midpoint to C and D is equal. Ask how many meters are the distance between A and B.
甲、乙两人同时从A、B两点出发，甲每分钟行80米，乙每分钟行60米，出发一段时间后，两人在距中点的C处相遇；如果甲出发后在途中某地停留了7分钟，两人将在距中点的D处相遇，且中点距C、D距离相等，问A、B两点相距多少米．
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">80 / 60</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">1 / (4/3)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/7) * (3/4)</gadget>
<output>9/28 = around 0.321429</output>

<gadget id="calculator">(4/7) - (9/28)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">7 / (1/4)</gadget>
<output>28</output>

<gadget id="calculator">60 * 28</gadget>
<output>1_680</output>

<result>1_680</result>