The fast and slow trains depart from the stations A and B at the same time. When the express train arrives at the midpoint of the two stations, the slow train has traveled (1/3) more than 3 kilometers for the whole journey, and the express train has traveled (2/3) the remaining distance. 3) At this time, the slow train is still 19.5 kilometers away from the whole journey (1/4) of A, how many kilometers is the distance between A and B stations?
快慢两车分别从AB两站同时相对开出，当快车到达两站的中点时，慢车才行了全程的(1/3)多3千米，当快车又行了余下路程的(2/3)时，这时慢车离A地还有全程的(1/4)还多19.5千米，AB两站相距多少千米？
<gadget id="calculator">49 / 4</gadget>
<output>49/4 = around 12.25</output>

<gadget id="calculator">7 / 72</gadget>
<output>7/72 = around 0.097222</output>

<gadget id="calculator">(49/4) / (7/72)</gadget>
<output>126</output>

<result>126</result>