Two cars, A and B, drive from A to B at the same time. When A travels 50% of the journey, B travels 54 kilometers away from A. When A arrives at B, B travels 80% of the journey. How many miles is the distance between A and B?
甲乙两车同时从A地开往B地，当甲车行了全程的50%时，乙车离A地54千米，当甲车到达B地时，乙车行了全程的80%．AB两地相距多少千米？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">54 / (2/5)</gadget>
<output>135</output>

<result>135</result>