A passenger train departs from A to B, and at the same time a freight train departs from B to A. After 12 hours, the bus will still have the full (1/9) distance from B, and the truck will exceed the midpoint by 50 kilometers. ． It is known that passenger cars travel 18 kilometers more per hour than trucks, how many kilometers are the distance between places A and B?
一列客车从甲地出发开往乙地，同时一列货车从乙地出发开往甲地，12小时后客车距乙地还有全程的(1/9)的路程，货车则超过中点50千米．已知客车每小时比货车多行18千米，甲、乙两地的路程是多少千米？
<gadget id="calculator">216 + 50</gadget>
<output>266</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/9) - (1/2)</gadget>
<output>7/18 = around 0.388889</output>

<gadget id="calculator">266 / (7/18)</gadget>
<output>684</output>

<result>684</result>