Car A drives from point A to point B, and car B drives from point B to point A at the same time. After 3 hours, car A is still 1/6 of the distance from point B, and car B exceeds the midpoint by 70 kilometers. At this time, car A travels 30 kilometers longer than car B. What is the distance in miles between A and B?
甲车从A地开往B地，乙车同时从B地开往A地，经过3小时后，甲车距离B地还有全程的(1/6)，乙车超过中点70千米，这时甲车比乙车多行30千米．A、B两地间距离是多少千米？
<gadget id="calculator">70 + 30</gadget>
<output>100</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/2) - (1/6)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">100 / (1/3)</gadget>
<output>300</output>

<result>300</result>