Two cars, A and B, start from the two cities A and B at the same time. After 4 hours, the car A travels 80% of the whole journey, and the car B exceeds the midpoint by 13 kilometers. It is known that the car A travels 3,000 more per hour than the car B. How many kilometers is the distance between A and B?
甲乙两车分别从A、B两城同时相对开出，经过4小时，甲车行了全程的80%，乙车超过中点13千米，已知甲车比乙车每小时多行3千米，A、B两城相距多少千米？
<gadget id="calculator">13 + 12</gadget>
<output>25</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(4/5) - (1/2)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">25 / (3/10)</gadget>
<output>250/3 = around 83.333333</output>

<result>250/3 = around 83.333333</result>