A and B are walking toward each other from A and B at the same time. A travels 210 meters per minute, and B travels 150 meters per minute. The two meet at a distance of 150 meters from the midpoint. How many kilometers are there between A and B?
甲乙两人同时从A、B两地相向而行，甲每分钟行210米，乙每分钟行150米，两人在距中点150米相遇．A、B两地相距多少千米？
<gadget id="calculator">150 * 2</gadget>
<output>300</output>

<gadget id="calculator">210 - 150</gadget>
<output>60</output>

<gadget id="calculator">300 / 60</gadget>
<output>5</output>

<gadget id="calculator">210 + 150</gadget>
<output>360</output>

<gadget id="calculator">360 / 1_000</gadget>
<output>9/25 = around 0.36</output>

<gadget id="calculator">5 * (9/25)</gadget>
<output>9/5 = around 1.8</output>

<result>9/5 = around 1.8</result>