Two cars, A and B, drive from point A to point B at the same time. When A travels 1/3 of the whole journey, B travels 20 kilometers. The speed of the two cars remains the same. There is a whole journey (1/4), how many kilometers is the road between AB and AB?
甲乙两车同时从A地开往B地，当甲行了全程的(1/3)时，乙行了20千米，两车的速度保持不变，当甲到达终点时，乙离终点还有全程的(1/4)，AB两地之间的公路长多少千米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / (1/3)</gadget>
<output>3</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 / (3/4)</gadget>
<output>4</output>

<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<result>80</result>