On a map with a scale of 1:8000000, the distance between A and B is 15cm. Cars A and B start at the same time and drive opposite each other. It is known that the speed of car A is 70 kilometers per hour, and the speed of car B is 50 kilometers per hour. After several hours meet?
在比例尺1：8000000的地图上量得AB两地相距15cm，甲乙两车分别同时出发相对而行，已知甲车速度是每小时70千米，乙车每小时行50千米，经过几小时相遇？
<gadget id="calculator">1 / 8_000_000</gadget>
<output>1/8_000_000 = around 0</output>

<gadget id="calculator">70 + 50</gadget>
<output>120</output>

<gadget id="calculator">15 / (1/8_000_000) / 100_000 / 120</gadget>
<output>10</output>

<result>10</result>