A and B practice long-distance running on the same straight line. From one end of the track to the other, A needs to run for 2 minutes, and B needs to run for 3 minutes. A and B start at the same time and return immediately after reaching the other end. They have practiced for 30 minutes in total. minutes, how many times did they meet during this time?
甲、乙二人在同一条直线上练长跑，从跑道的一端到另一端，甲要跑2分钟，乙要跑3分钟，甲、乙同时起跑，到另一端后立即返回，一共练了30分钟，这期间他们相遇了多少次？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/2) + (1/3)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / (5/6)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">30 - (6/5)</gadget>
<output>144/5 = around 28.8</output>

<gadget id="calculator">2 / (5/6)</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">(144/5) / (12/5)</gadget>
<output>12</output>

<gadget id="calculator">1 + 12</gadget>
<output>13</output>

<result>13</result>