Cars A and B leave from places A and B respectively at the same time. After 4 hours, car A travels 80% of the whole journey, and car B exceeds the midpoint by 12 kilometers. It is known that car A travels more than car B per hour 30 kilometers, how many kilometers is the distance between A and B?
甲、乙两车分别从A、B两地同时相对开出，经过4小时，甲车行了全程的80%，乙车超过中点12千米，已知甲车比乙车每小时多行30千米，A、B两地相距多少千米？
<gadget id="calculator">30 * 4</gadget>
<output>120</output>

<gadget id="calculator">12 + 120</gadget>
<output>132</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">132 / (3/10)</gadget>
<output>440</output>

<result>440</result>