Car A and car B leave opposite places A and B. When A travels 2/5 of the whole journey, car B travels 18 kilometers; when car A arrives at point B, car B leaves A There are 9 kilometers. How many kilometers are there between A and B?
甲、乙两车从A、B两地相对开出，当甲行了全程的(2/5)时，乙车行了18千米；当甲车到达B地时，乙车离A地还有9千米．A、B两地相距多少千米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">18 / (2/5)</gadget>
<output>45</output>

<gadget id="calculator">45 + 9</gadget>
<output>54</output>

<result>54</result>