Two people, A and B, go from A to B at the same time. A travels 250 meters per minute, and B travels 90 meters per minute. After A arrives at B, he immediately returns to A and meets B at a distance of 1200 meters from B. How many miles is the distance between B and B?
甲、乙两人同时从A地去B地，甲每分钟行250米，乙每分钟行90米，甲到达B地后立即返回A地，在离B地1200米处与乙相遇，A、B两地相距多少千米？
<gadget id="calculator">1_200 * 2</gadget>
<output>2_400</output>

<gadget id="calculator">250 - 90</gadget>
<output>160</output>

<gadget id="calculator">2_400 / 160</gadget>
<output>15</output>

<gadget id="calculator">250 + 90</gadget>
<output>340</output>

<gadget id="calculator">340 / 2</gadget>
<output>170</output>

<gadget id="calculator">15 * 170</gadget>
<output>2_550</output>

<result>2_550</result>