Car A and car B drive from city A to city B which is 300 kilometers away at the same time. It is known that car A departs an hour later than car B, but arrives in city B half an hour earlier. Then, how many kilometers away is car A from city B? Where to catch up with car B?
甲乙两车同时从A城市出发驶向距离300千米远的B城市，已知甲车比乙车晚出发一个小时，但是提前半小时到达城市B，那么，甲车在距离B城市多少千米处追上乙车？
<gadget id="calculator">1.5 / 300</gadget>
<output>0.005</output>

<gadget id="calculator">300 * 0.005</gadget>
<output>1.5</output>

<gadget id="calculator">1.5 - 1</gadget>
<output>0.5</output>

<gadget id="calculator">0.5 / 0.005</gadget>
<output>100</output>

<result>100</result>