Qiao Qiao walked 720 meters from school to home for 12 minutes. She walked home from the amusement park 420 meters away from home at the same speed. How many minutes would it take? (Column comprehensive formula solution)
乔乔从学校到家720米共走了12分钟，她以同样的速度，从距家420米的游乐园走回家，要走几分钟？(列综合算式解答)
<gadget id="calculator">720 / 12</gadget>
<output>60</output>

<gadget id="calculator">420 / 60</gadget>
<output>7</output>

<result>7</result>