Cars A and B drive from point A to point B at the same time. Car B returns immediately after arriving at point B, and then drives to point B immediately after arriving at point A. In this way, the two cars finally arrive at point B at the same time, and they meet on the way Three times, and the distance between the first meeting point and the second meeting point is 36 kilometers, find the distance between the third meeting point and B?
甲、乙两车同时从A地驶往B地，乙车到达B地后立即返回，再到达A地后又立即驶往B地，如此往复，最后两车同时到达B地，他们中途共相遇三次，且第一次相遇点与第二次相遇点距离36千米，求第三次相遇点与B地距离？
<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/6) * 2</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">2 / (1/6)</gadget>
<output>12</output>

<gadget id="calculator">(1/6) * 12</gadget>
<output>2</output>

<gadget id="calculator">36 * 2</gadget>
<output>72</output>

<result>72</result>