Cars A and B are traveling towards each other from A and B. When car A has traveled the whole distance (3/20), car B has traveled the whole distance (1/5). When car A is still far from B At (1/4), car B just arrives at point A and returns immediately. When car A arrives at point B, what fraction of the distance has B returned from point B?
甲乙两车从A、B两地相向现而行，当甲车行了全程的(3/20)的时候，乙车行了全程的(1/5)，当甲车距B还有全程的(1/4)的时候，乙车正好到达A地，并立即返回，当甲车到达B地时，乙车距B地还的全程的几分之几？
<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

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

<gadget id="calculator">(3/20) / (1/5)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / (3/4)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(4/3) - 1</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>