A and B are running back and forth on a straight road with a distance of 180 meters. A's speed is 3 meters per second, and B's speed is 2 meters per second. If they start at both ends of the straight road at the same time, when they run 20 minutes, how many times did you meet during this time?
甲乙两人在相距180米的直路上来回跑步，甲的速度是每秒钟跑3米，乙的速度是每秒钟跑2米，如果他们同时分别在直路两端出发，当他们跑了20分钟，那么在这段时间内共相遇了多少次？
<gadget id="calculator">33 - 1</gadget>
<output>32</output>

<gadget id="calculator">32 / 2</gadget>
<output>16</output>

<gadget id="calculator">16 + 1</gadget>
<output>17</output>

<result>17</result>