The distance from Chenghai to Fuzhou is about 500 kilometers. If a car starts from Chenghai, it will be 10 kilometers away from Fuzhou in 7 hours. What is the speed of this car?
从澄海到福州的路程大约是500千米，一辆汽车从澄海出发，7小时后距福州还有10千米，这辆汽车的速度是多少？
<gadget id="calculator">500 - 10</gadget>
<output>490</output>

<gadget id="calculator">490 / 7</gadget>
<output>70</output>

<result>70</result>