A walks 80 meters per minute, and B walks 60 meters per minute. A and B start from AB at the same time and walk toward each other. They meet at a place 120 meters away from the midpoint of AB. If A rests for a period of time and continues to move forward, then the two still meet at a place 120 meters away from the midpoint of A and B. How many minutes did A rest?
甲每分钟走80米，乙每分钟走60米，甲、乙二人从AB两地同时出发相向而行，二人在离AB两地中点120米的地方相遇．如果甲在中途休息一段时间继续前进，那么，二人还在离AB两地中点120米的地方相遇，甲休息了几分钟？
<gadget id="calculator">80 - 60</gadget>
<output>20</output>

<gadget id="calculator">2 / 20</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">120 * (1/10) * 140</gadget>
<output>1_680</output>

<gadget id="calculator">1_680 / 2</gadget>
<output>840</output>

<gadget id="calculator">840 + 120</gadget>
<output>960</output>

<gadget id="calculator">960 / 60</gadget>
<output>16</output>

<gadget id="calculator">1_680 - 960</gadget>
<output>720</output>

<gadget id="calculator">720 / 80</gadget>
<output>9</output>

<gadget id="calculator">16 - 9</gadget>
<output>7</output>

<result>7</result>