Xiao Ming's home is 1800 meters away from the school, it takes 6 minutes to ride a bicycle and 30 minutes to walk. One morning he rode his bike first, and the wheel broke after 2 minutes. He had to walk to school. How many minutes until he got to school?
小明家到学校1800米，骑车需要6分钟，步行需要30分钟．一天早上他先骑车，行了2分钟车轮坏了，这时他只好步行去学校，还有多少分钟才能到学校？
<gadget id="calculator">1_800 / 6</gadget>
<output>300</output>

<gadget id="calculator">300 * 2</gadget>
<output>600</output>

<gadget id="calculator">1_800 - 600</gadget>
<output>1_200</output>

<gadget id="calculator">1_800 / 30</gadget>
<output>60</output>

<gadget id="calculator">1_200 / 60</gadget>
<output>20</output>

<result>20</result>