Two people, A and B, are walking by a circular pond with a circumference of 120 meters. A walks 8 meters per minute, and B walks 7 meters per minute. Now starting from the same place at the same time, walking opposite each other, how much time did it take to meet the second time after departure?
甲、乙二人在周长是120米的圆形池塘边散步，甲每分走8米，乙每分走7米．现在从同一地点同时出发，相背而行，出发后到第二次相遇用了多少时间？
<gadget id="calculator">8 + 7</gadget>
<output>15</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">120 * (2/15)</gadget>
<output>16</output>

<result>16</result>