Car A and car B leave opposite places at the same time. After 2 hours, car A arrives at the midpoint of the two places, and car B travels the entire distance (3/7). It is known that car A travels 10 kilometers longer than car B every hour, find the distance between the two places.
甲、乙两车同时从两地相对开出，2小时后，甲车正好到达两地的中点，乙车行了全程的(3/7)．已知甲车每时比乙车多行10千米，求两地的路程．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(1/2) - (3/7)</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">10 / (1/14)</gadget>
<output>140</output>

<gadget id="calculator">2 * 140</gadget>
<output>280</output>

<result>280</result>