Two cars depart from places A and B at the same time. Car A travels 50 kilometers per hour, and car B travels 20% more than car A per hour. After 4 hours, the two cars have traveled 80% of the entire journey. How many kilometers are there between B and B?
两辆汽车分别同时从甲、乙两地相对开出，甲车每小时行50千米，乙车每小时比甲车多行20%，经过4小时两车共行了全程的80%，甲、乙两地相距多少千米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">50 * (6/5)</gadget>
<output>60</output>

<gadget id="calculator">60 + 50</gadget>
<output>110</output>

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

<gadget id="calculator">4 / (4/5)</gadget>
<output>5</output>

<gadget id="calculator">110 * 5</gadget>
<output>550</output>

<result>550</result>