A and B start from A and B at the same time, and A's speed is B's (5/6). After the first encounter, they continue to drive, and when they arrive at A and B, they return immediately on the same road and at the same speed. , the second meeting on the way, the distance between the two meeting places is 4 kilometers, then how many kilometers is the distance between A and B? (column solution)
甲乙两人分别从A，B两地同时相向出发，甲的速度是乙的(5/6)，两人第一次相遇后继续行驶，到达A，B两地立即按原路，原速度返回，途中第二次相遇，两次相遇地点之间的距离是4千米，那么A，B两地之一间的距离是多少千米？(列式解答)
<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<gadget id="calculator">7 / 11</gadget>
<output>7/11 = around 0.636364</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">(7/11) - (5/11)</gadget>
<output>2/11 = around 0.181818</output>

<gadget id="calculator">4 / (2/11)</gadget>
<output>22</output>

<result>22</result>