It takes 1 hour and 20 minutes for a certain car to go from station A to station B, and the cars at the two stations are traveling in opposite directions. In order to ensure that there is a car traveling to each other every 10 minutes, how many passenger cars must the bus company arrange at least.
某车从甲站到乙站需要1小时20分，两站汽车相向而行．为保证每隔10分钟有一辆汽车向对方行驶，公交公司至少需要安排多少辆客车．
<gadget id="calculator">80 / 10</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<result>9</result>