Xiaohua walks 60 meters per minute to get out of school and 80 meters per minute after school. In this way, it takes 21 minutes for him to walk to school and after school. How many meters is the distance from Xiaohua's house to school?
小华上学每分钟走60米，放学每分钟走80米，这样他上学和放学走路共用去21分钟，小华家到学校的路程是多少米？
<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">21 * (4/7)</gadget>
<output>12</output>

<gadget id="calculator">12 * 60</gadget>
<output>720</output>

<result>720</result>