The distance between A and B is 225km. A bus departs from A to B. After driving for 5 hours, it is still 25km away from B. How many kilometers per hour does this bus travel on average?
甲乙两地相距225km，一辆客车从甲地出发开往乙地，开出5小时后离乙地还有25km，这辆客车平均每小时行多少km？
<gadget id="calculator">225 - 25</gadget>
<output>200</output>

<gadget id="calculator">200 / 5</gadget>
<output>40</output>

<result>40</result>