Cars A and B are traveling toward each other from AB at the same time. The first encounter is at a distance of 10 kilometers from the midpoint. The two cars return immediately after arriving at AB. When they meet for the second time, Car A travels longer than Car B. (2/5), how many kilometers is the distance between A and B?
甲乙两车同时从AB两地相向而行，第一次相遇在距中点10千米处相遇，两车到达AB地后立刻返回，第二次相遇时，甲车比乙车多行全程的(2/5)，AB相距多少千米？
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">7 / 12</gadget>
<output>7/12 = around 0.583333</output>

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

<gadget id="calculator">(7/12) - (1/2)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">10 / (1/12)</gadget>
<output>120</output>

<result>120</result>