It takes two days for a car to travel from point A to point B. On the first day, the whole journey (2/5) is 168 kilometers longer. The ratio of the distance traveled on the second day to the distance on the first day is 1:4 , how many kilometers is the distance between AB and AB?
一辆车从A地行驶到B地用了两天时间，第一天行了全程的(2/5)多168千米，第二天行的路和第一天的路程比是1：4，AB两地相距多少千米？
<gadget id="calculator">1 + 4</gadget>
<output>5</output>

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

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(4/5) - (2/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">168 / (2/5)</gadget>
<output>420</output>

<result>420</result>