Two people, A and B, ride bicycles from the two cities A and B at the same time. After 4 hours, A travels 80% of the whole journey, and B exceeds the midpoint by 15 kilometers. It is known that A travels 3,000 more per hour than B. How many kilometers is the distance between A and B?
甲、乙两人骑自行车分别从A、B两城同时相对而行，经过4小时，甲行了全程的80%，乙超过中点15千米，已知甲比乙每小时多行3千米，A、B两城相距多少千米？
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 + 15</gadget>
<output>27</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">27 / (3/10)</gadget>
<output>90</output>

<result>90</result>