Two trains, A and B, depart from cities A and B, which are 1000 kilometers apart, at the same time. The speed of train A is 120 kilometers per hour, and the speed of train B is 80 kilometers per hour. They arrive at B and B respectively. After the two cities, rest for 2 hours each, and then return to the original road. How many hours does it take for trains A and B to meet for the second time from the first departure?
甲、乙两列火车分别从相距1000千米的A、B两城同时相对开出，甲车的速度为每小时120千米，乙车的速度为每小时80千米，它们分别到达B、A两城后，各休息2小时，然后原路返回．甲、乙两列火车从刚开始出发到第二次相遇共需要多少小时？
<gadget id="calculator">120 + 80</gadget>
<output>200</output>

<gadget id="calculator">2 / 200</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">1_000 * (1/100)</gadget>
<output>10</output>

<gadget id="calculator">10 + 2</gadget>
<output>12</output>

<result>12</result>