On a map with a scale of 1:32000000, the distance between A and B is 4.5 cm. If a passenger car and a truck leave A and B at the same time, they meet after 12 hours. It is known that the passenger car travels 65 kilometers per hour, so how many kilometers per hour does the truck travel?
在比例尺是1：32000000的地图上，量得甲、乙两地的距离为4.5厘米，如果一辆客车和货车同时从甲乙两地相对开出，经过12小时相遇．已知客车每小时行65千米，那么货车每小时行多少千米？
<gadget id="calculator">320 * 4.5</gadget>
<output>1_440</output>

<gadget id="calculator">1_440 / 12</gadget>
<output>120</output>

<gadget id="calculator">120 - 65</gadget>
<output>55</output>

<result>55</result>