The distance between A and B is 280 kilometers. A bus travels from A to B. After driving for 4 hours, it is still 20 kilometers away from B. How many miles per hour does the car travel on average?
甲、乙两地有280千米，一辆客车从甲地开往乙地，开出4小时后离乙地还有20千米．这辆汽车平均每小时行多少千米？
<gadget id="calculator">280 - 20</gadget>
<output>260</output>

<gadget id="calculator">260 / 4</gadget>
<output>65</output>

<result>65</result>