Xiao Ming and Xiao Hua run back and forth on a straight road 120 meters apart. A's speed is 3 meters per second and B's speed is 4 meters per second. If they started at both ends of the straight road at the same time, when they ran for 10 minutes, how many times did they meet during this time?
小明和小华在相距120米的直路上来回跑步．甲的速度是每秒3米，乙的速度是每秒4米．如果他们同时分别在直路两端出发，当他们跑了10分钟，在这段时间内他们共相遇了多少次．
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">120 / 7</gadget>
<output>120/7 = around 17.142857</output>

<gadget id="calculator">600 - (120/7)</gadget>
<output>4_080/7 = around 582.857143</output>

<gadget id="calculator">240 / 7</gadget>
<output>240/7 = around 34.285714</output>

<gadget id="calculator">(4_080/7) / (240/7)</gadget>
<output>17</output>

<gadget id="calculator">17 + 1</gadget>
<output>18</output>

<result>18</result>