An express train and a slow train are traveling towards each other from places A and B at the same time. After 3 hours, the express train is still 1/4 of the full distance from point B, and the slow train is still 54 kilometers away from point A. It is known that the speed of the express train per hour is The slow train travels 5 kilometers longer, how many kilometers is the distance between A and B?
一辆快车和一辆慢车同时从甲乙两地相向而行，3小时后，快车距乙地还有全程的(1/4)，慢车距甲地还有54千米，已知快车每小时比慢车多行5千米，甲乙两地相距多少千米？
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">54 - 15</gadget>
<output>39</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">39 / (1/4)</gadget>
<output>156</output>

<result>156</result>