Xiao Ming's house is 1200 meters away from the school. This morning, I walked 180 meters in 3 minutes to school. At this speed, how many minutes will I have to walk to get to school? (Solve using ratio method)
小明家到学校共1200米．今天早上上学3分钟共走了180米，照这样的速度，还要走多少分钟才能到学校？(用比例方法解答)
<gadget id="calculator">1_200 - 180</gadget>
<output>1_020</output>

<gadget id="calculator">180 / 3</gadget>
<output>60</output>

<gadget id="calculator">1_020 / 60</gadget>
<output>17</output>

<result>17</result>