The distance between A and B is 720 kilometers. A passenger car and a truck drive towards each other from A and B at the same time. The bus travels 64 kilometers per hour. The two vehicles meet at 6 o'clock. How many kilometers per hour does the truck travel?
甲乙两地相距720千米，一辆客车和一辆货车同时从甲乙两地相向而行，客车每时行64千米，两车经过6时相遇，货车每时行多少千米？
<gadget id="calculator">720 / 6</gadget>
<output>120</output>

<gadget id="calculator">120 - 64</gadget>
<output>56</output>

<result>56</result>