A car traveled a total of 210 kilometers from 8:00 am to 3:00 pm; how many kilometers per hour did the car travel?
一辆汽车从上午8时到下午3时共行驶了210千米；这辆汽车每小时行驶了多少千米？
<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<gadget id="calculator">210 / 7</gadget>
<output>30</output>

<result>30</result>