The distance between A and B is 300 kilometers. After a car drives from A for 5 hours, it is still 74.5 kilometers away from B. How many kilometers per hour does the car drive on average?
甲乙两地相距300千米，一辆汽车由甲地开出5小时后，距离乙地还有74.5千米，这辆汽车平均每小时行多少千米？
<gadget id="calculator">300 - 74.5</gadget>
<output>225.5</output>

<gadget id="calculator">225.5 / 5</gadget>
<output>45.1</output>

<result>45.1</result>