Cars A and B depart from places A and B at the same time, respectively, and meet each other 4 hours later. After meeting each other, they continued to move forward, and after another 3 hours, car A arrived at point B, and car B was still 70 kilometers away from point A. Find the distance between A and B in kilometers?
甲、乙两车分别从A、B两地相对同时开出，4小时后相遇．相遇后各自继续前进，又经过3小时，甲车到达B地，乙车离A地还有70千米．求A、B两地相距多少千米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">70 / (1/4)</gadget>
<output>280</output>

<result>280</result>