Cars A and B start from A and B at the same time respectively, and drive back and forth between A and B continuously. The speed ratio of A and B is 3:7, and A and B meet for the 999th time at the 998th meeting point The distance between the points is 60 kilometers (when A and B are in the same direction, it is not counted as an encounter if B catches up with A). Question: How many kilometers are there between A and B?
甲、乙两车分别从A、B两地同时出发，在A、B之间不断往返行驶，甲、乙速度比为3：7，并且甲、乙在第998次相遇点与第999次相遇点相距60千米(甲、乙同向时，乙车追上甲车不算相遇)．问：A、B相距多少千米？
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">15 * 10</gadget>
<output>150</output>

<result>150</result>