Xiaohong has to walk 800 meters from home to school, she walks 42 meters per minute, and walks for 12 minutes, how far is she from school?
小红从家到学校要走800米，她每分钟走42米，走了12分钟，她距离学校还有多远？
<gadget id="calculator">42 * 12</gadget>
<output>504</output>

<gadget id="calculator">800 - 504</gadget>
<output>296</output>

<result>296</result>