There is a bus with a body length of 15 meters on the road, running from east to west at a speed of 18 kilometers per hour. There are two young people A and B on the sidewalk beside the road who are practicing long-distance running. A is running from east to west. B runs from west to east. At a certain moment, the car catches up with A, and the car leaves A after 6 seconds; half a minute later, the car encounters B running head-on; after another 2 seconds, the car leaves B. Ask how many seconds later, A and B meet.
马路上有一辆车身为15米的公共汽车，由东向西行驶，车速为每小时18千米，马路一旁的人行道上有甲、乙两名年轻人正在练长跑，甲由东向西跑，乙由西向东跑．某一时刻，汽车追上甲，6秒钟后汽车离开了甲；半分钟之后汽车遇到迎面跑来的乙；又过了2秒钟，汽车离开了乙．问再过多少秒后，甲、乙两人相遇．
<gadget id="calculator">0.5 * 60</gadget>
<output>30</output>

<gadget id="calculator">30 + 2</gadget>
<output>32</output>

<gadget id="calculator">1_000 / 3_600</gadget>
<output>5/18 = around 0.277778</output>

<gadget id="calculator">18 * (5/18)</gadget>
<output>5</output>

<gadget id="calculator">32 * 5</gadget>
<output>160</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<gadget id="calculator">30 - 15</gadget>
<output>15</output>

<gadget id="calculator">15 / 6</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) * 32</gadget>
<output>80</output>

<gadget id="calculator">160 - 80</gadget>
<output>80</output>

<gadget id="calculator">(5/2) + (5/2)</gadget>
<output>5</output>

<gadget id="calculator">80 / 5</gadget>
<output>16</output>

<result>16</result>