Two cars A and B drive from AB at the same time and meet at a distance of 15 kilometers from the midpoint in 6 hours. It is known that the speed of A is (7/10) the speed of B. Find the distance between A and B.
甲乙两辆汽车分别从AB两地同时开出，6小时相遇在距中点的15千米处，已知甲车速度是乙车速度的(7/10)，求AB两地的距离．
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">30 / (3/10)</gadget>
<output>100</output>

<gadget id="calculator">1 + (7/10)</gadget>
<output>17/10 = around 1.7</output>

<gadget id="calculator">100 * (17/10)</gadget>
<output>170</output>

<result>170</result>