It takes 5 hours for A to travel from A to B, and B travels from B to A at a speed (5/8) of A. Now A and B start from A and B respectively at the same time and walk toward each other. After meeting on the way, they continue to move forward. A returns immediately after arriving at B, and B returns immediately after arriving at A. They meet again on the way. If the distance between the two meeting points is 36 kilometers, what is the distance between A and B? km?
甲从A地到B地需要5小时，乙从B地到A地，速度是甲的(5/8)，现在甲、乙两人分别从A、B两地同时出发，相向而行，在途中相遇后继续前进，甲到B地后立即返回，乙到A地后也立即返回，他们在途中又相遇一次，如果两次相遇点相距36千米，A、B两地间的距离是多少千米？
<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">8 / 13</gadget>
<output>8/13 = around 0.615385</output>

<gadget id="calculator">(8/13) * 3</gadget>
<output>24/13 = around 1.846154</output>

<gadget id="calculator">2 - (24/13)</gadget>
<output>2/13 = around 0.153846</output>

<gadget id="calculator">(8/13) - (2/13)</gadget>
<output>6/13 = around 0.461538</output>

<gadget id="calculator">36 / (6/13)</gadget>
<output>78</output>

<result>78</result>