It takes 6 hours to travel by bus from Chengdu to Yibin, and 4 hours to travel by truck. If the two cars depart from the two stations at the same time, when the truck reaches the midpoint of the two stations, the bus is still 54 kilometers away from the midpoint. Find the distance between the two stations in Yibin, Chengdu.
从成都到宜宾客车行完全程要6小时，货车行完全程要4小时．如果两车分别从两站同时相对开出，当货车行到两站中点时，客车离中点还有54千米，求成都宜宾两站地的距离．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">(1/6) * 2</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">54 / (1/6)</gadget>
<output>324</output>

<result>324</result>