The distance between A and B is 320 kilometers. A bus and a truck drive towards each other at the same time. After 2 hours, the distance between the two cars is 80 kilometers. It is known that the passenger car travels 65 kilometers per hour, how many kilometers per hour does the truck travel?
甲乙两地相距320千米，客车与货车同时从两地相向而行，2小时后两车相距80千米．已知客车每时行65千米，货车每时行多少千米？
<gadget id="calculator">320 - 80</gadget>
<output>240</output>

<gadget id="calculator">240 / 2</gadget>
<output>120</output>

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

<result>55</result>