The distance between A and B is 350 kilometers. A truck and a bus drive towards each other at the same time. After 3.5 hours, the truck travels 45 kilometers per hour. How many kilometers per hour does the bus travel?
甲、乙两地相距350千米，一辆货车和一辆客车同时从两地相向开车，经过3.5小时相遇，货车每小时行45千米，客车每小时行多少千米？
<gadget id="calculator">350 / 3.5</gadget>
<output>100</output>

<gadget id="calculator">100 - 45</gadget>
<output>55</output>

<result>55</result>