After driving from point A to point B, both cars return to point A immediately. Car A travels 100 kilometers first before car B leaves. When car B arrives at point B, car A has driven back 10 kilometers. When returning to point A, car A still has the whole journey (2/9) away from point A, how many kilometers is the distance between A and B?
A地开往B地后，两车都立即返回A地，甲车先行100千米，乙车才开出，当乙车到达B地时，甲车已往回驶了10千米，当乙车回到A地时，甲车离A地还有全程的(2/9)，求AB两地相距多少千米？
<gadget id="calculator">100 - 10</gadget>
<output>90</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">2 / (2/9)</gadget>
<output>9</output>

<gadget id="calculator">90 * 9</gadget>
<output>810</output>

<result>810</result>