Two cars A and B are traveling toward each other from two cities AB at the same time. Car A travels 110 kilometers per hour, and car B travels 100 kilometers per hour. After 3 hours, the two cars meet. How many miles is the distance between A and B?
甲乙两车同时从AB两座城市相向而行，甲车每小时行110千米，乙车每小时行100千米，3小时后两车相遇．AB两地相距多少千米？
<gadget id="calculator">110 + 100</gadget>
<output>210</output>

<gadget id="calculator">210 * 3</gadget>
<output>630</output>

<result>630</result>