The distance between A and B is 550 kilometers. A passenger car and a truck drive from the two places at the same time. They meet each other in 5 hours. The speed of the truck is slower than that of the passenger car (2/11). How many kilometers per hour does the passenger car travel?
甲乙两地相距550千米，一辆客车和一辆货车同时从两地相对开出，5小时相遇，货车速度比客车速度慢(2/11)，客车每小时行多少千米？
<gadget id="calculator">2 / 11</gadget>
<output>2/11 = around 0.181818</output>

<gadget id="calculator">1 - (2/11)</gadget>
<output>9/11 = around 0.818182</output>

<gadget id="calculator">1 + (9/11)</gadget>
<output>20/11 = around 1.818182</output>

<gadget id="calculator">550 / 5 / (20/11)</gadget>
<output>121/2 = around 60.5</output>

<result>121/2 = around 60.5</result>