Cars A and B start from stations A and B at the same time. When the two cars meet for the first time, car A travels 100 kilometers. After the two cars arrive at stations B and A respectively, they return at the same speed. When the cars meet for the second time, car A is 70 kilometers away from station A, what is the distance in kilometers between stations A and B?
甲、乙两车同时从A、B两站出发，两车第一次相遇时，甲车行了100千米，两车分别到达B站和A站后，立即又以原速返回，当两车第二次相遇时，甲车离A站70千米，则A、B两站间的距离是多少千米．
<gadget id="calculator">100 * 3</gadget>
<output>300</output>

<gadget id="calculator">300 + 70</gadget>
<output>370</output>

<gadget id="calculator">370 / 2</gadget>
<output>185</output>

<result>185</result>