Two cars, A and B, drive from A to B at the same time. When car A travels halfway, car B is still 54 kilometers away from point B. When car A arrives at point B, car B has traveled 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．当甲车行完全程的一半时，乙车离B地还有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">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(4/5) * (1/2)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">54 / (3/5)</gadget>
<output>90</output>

<result>90</result>