It takes 5 hours for A to go from A to B, and B takes 5/8 of A's speed to go from B to 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, move on. A returns immediately after arriving at point B, and B returns immediately after arriving at point A. They meet again on the way. If the distance between the two meeting points is 72 kilometers, how many kilometers are the distance between A and B?
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、乙二人分别从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，他们在途中又一次相遇．如果两次相遇点相距72千米，A、B两地相距多少千米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(1/5) * (5/8)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/5) + (1/8)</gadget>
<output>13/40 = around 0.325</output>

<gadget id="calculator">1 / (13/40)</gadget>
<output>40/13 = around 3.076923</output>

<gadget id="calculator">(1/5) * (40/13)</gadget>
<output>8/13 = around 0.615385</output>

<gadget id="calculator">(1/5) * (40/13) * 2</gadget>
<output>16/13 = around 1.230769</output>

<gadget id="calculator">2 - (8/13) - (16/13)</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">72 / (6/13)</gadget>
<output>156</output>

<result>156</result>