The distance between Station A and Station B is 630 kilometers. A truck drives from Station A to Station B at 9:00 am and arrives on time at 4:00 pm. How many kilometers does this truck drive on average per hour?
甲站到乙站相距630千米，一辆货车上午9时从甲站开往乙站，下午4时准时到达，这辆货车平均每小时行驶多少千米？
<gadget id="calculator">630 / 7</gadget>
<output>90</output>

<result>90</result>