Two cars, passenger and freight, are running towards each other from A and B at the same time. After 12 hours, the passenger car is still 1/9 of the distance from B, and the truck is 50 km beyond the midpoint. It is known that the passenger car travels 18 km more than the truck per hour. A and B How many miles is the distance between the two places?
客、货两车同时从甲乙两地相向而行，12小时后客车距乙地还有全程的(1/9)，货车则超过中点50km，已知每小时客车比货车多行18km，甲乙两地的路程是多少千米？
<gadget id="calculator">12 * 18</gadget>
<output>216</output>

<gadget id="calculator">216 + 50</gadget>
<output>266</output>

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

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

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

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

<result>684</result>