A passenger car and a truck leave opposite places A and B at the same time. They meet each other in 5 hours. After meeting, the two cars continue to drive forward for 2 hours. At this time, the bus is still 130 kilometers away from point B, and the truck is far away from A. The ground is still 170 kilometers away. How many kilometers is the distance 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小时相遇，相遇后两车又各自继续向前行驶2小时，这时客车离B地还有130千米，货车离A地还有170千米，A、B两地相距多少千米？
<gadget id="calculator">130 + 170</gadget>
<output>300</output>

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">300 / 3</gadget>
<output>100</output>

<gadget id="calculator">100 * 5</gadget>
<output>500</output>

<result>500</result>