The distance between A and B is 480 km. A large truck and a passenger car depart from places A and B opposite each other at the same time. After 4 hours, the two vehicles meet. The large truck travels 45 kilometers per hour. How many kilometers per hour does the passenger car travel?
甲、乙两地相距480千米．大货车和客车同时从甲、乙两地相对开出，4小时后两车相遇，大货车每小时行45千米，客车每小时行多少千米？
<gadget id="calculator">480 / 4</gadget>
<output>120</output>

<gadget id="calculator">120 - 45</gadget>
<output>75</output>

<result>75</result>