Cars A and B are traveling toward each other from places A and B at the same time. When they meet for the first time, car A is 70 meters away from place A. Then the two cars continue to move forward, and then turn around and return when they reach the end point. When they met for the second time, car A was 20 kilometers away from point B. How many kilometers are there between A and B?
甲、乙两辆汽车同时从A、B两地相向而行，第一次相遇时甲车距A地70米，然后两车继续前行，到终点后再掉头返回．第二次相遇时，甲车距B地20千米．A、B两地相距多少千米？
<gadget id="calculator">70 * 3</gadget>
<output>210</output>

<gadget id="calculator">210 - 20</gadget>
<output>190</output>

<result>190</result>