The distance between A and B is 630 kilometers. A car departs from A at 7:00 a.m. and arrives at B at 4:00 p.m. How many kilometers per hour does the car travel on average?
甲、乙两地相距630千米，一辆汽车上午7时从甲地出发，下午4时到达乙地，这辆汽车平均每小时行多少千米？
<gadget id="calculator">630 / 9</gadget>
<output>70</output>

<result>70</result>