A car drives from point A to point B. It travels the whole distance (1/5) in the first hour, and travels 10 kilometers less in the second hour than in the first hour. At this time, the ratio of the distance traveled to the distance that has not been traveled is 3:5, how many kilometers is the distance between AB and AB?
一辆汽车从A地开往B地，第一小时行了全程的(1/5)，第二小时比第一小时少行10千米，这时已行的路程与未行的路程比是3：5，求AB两地相距多少千米？
<gadget id="calculator">30 + 50</gadget>
<output>80</output>

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

<gadget id="calculator">80 / (1/5)</gadget>
<output>400</output>

<result>400</result>