An express train and a slow train are traveling towards each other from A and B at the same time. After 6 hours, they meet each other. After meeting, the two trains continue to drive for 2 hours. At this time, the express train is still 20% of the distance from B, and the slow train has traveled 400 miles. Kilometers, how many kilometers is the total distance between A and B?
一列快车和一列慢车从A、B两地同时相向而行，经过6小时后相遇，相遇后两车又继续行驶2小时，这时快车距B地还差全程的20%，慢车共行了400千米，A、B两地之间的路程共多少千米？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) * 2</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(1/3) - (4/5)</gadget>
<output>-7/15 = around -0.466667</output>

<gadget id="calculator">1 + (-7/15)</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">400 / (8/15)</gadget>
<output>750</output>

<result>750</result>