Cars A and B start from places A and B at the same time, and travel continuously between places A and B. The speed ratio of cars A and B is 3:7, and the speed ratio between cars A and B is 2008 times. The location of the 2009th encounter is exactly 120 kilometers apart. (Note: When A and B are traveling in the same direction, it is not counted as an encounter if B catches up with A). What is the distance in miles between A and B?
甲，乙两车分别从A，B两地同时出发，在A，B两地之间不断往返行驶，甲，乙两车的速度比是3：7，并且甲，乙两车第2008次和第2009次相遇的地点恰好相距120千米，(注：当甲，乙两车同向时，乙车追上甲车不算作相遇)．那么A，B两地之间的距离是多少千米．
<gadget id="calculator">1 - 0.5 - 0.1</gadget>
<output>0.4</output>

<gadget id="calculator">120 / 0.4</gadget>
<output>300</output>

<result>300</result>