A and B are running back and forth on a 200-meter circular track. A's speed is 3 meters per second, and B's speed is 2 meters per second. If they started at the same time from opposite ends of the diameter and ran for 10 minutes, how many times did they meet during this time?
甲、乙二人在200米的环形跑道上来回跑步，甲的速度是每秒3米，乙的速度是每秒2米．如果他们同时从直径两端相向出发，跑了10分钟，那么在这段时间内共相遇多少次？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">10 / (2/3)</gadget>
<output>15</output>

<result>15</result>