A passenger car and a truck depart from A and B oppositely at the same time and meet each other 5 hours later. After the encounter, the two cars continue to drive forward for 3 hours. At this time, the bus is still 180km away from point B, and the truck is still 210km away from point A. How many kilometers are there between A and B?
一辆客车和一辆货车同时从A、B两地相对开出，5小时后相遇．相遇后两车又各自继续向前行驶了3小时，这时客车离B地还有180km，货车离A地还有210km，A、B两地相距多少千米？
<gadget id="calculator">180 + 210</gadget>
<output>390</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">390 / (2/5)</gadget>
<output>975</output>

<result>975</result>