Car A and car B leave from the two cities A and B at the same time. After 4 hours, car A travels 80% of the whole journey, and car B exceeds the midpoint by 35 kilometers. It is known that car A travels more than car B per hour 10 kilometers. How many miles 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35千米，已知甲车比乙车每小时多行10千米．问A、B两城相距多少千米？
<gadget id="calculator">40 + 35</gadget>
<output>75</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">75 / (3/10)</gadget>
<output>250</output>

<result>250</result>