Teacher Li rides a bicycle to work. She rides an average of 210 meters per minute. After 12 minutes, she is still 480 meters away from the school. How many kilometers is Mr. Li's home from the school?
李老师骑自行车上班，她平均每分钟骑车行驶210米，行了12分钟，距学校还有480米．李老师家离学校有多少千米？
<gadget id="calculator">210 * 12</gadget>
<output>2_520</output>

<gadget id="calculator">2_520 + 480</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 / 1_000</gadget>
<output>3</output>

<result>3</result>