The two brothers set off from home to school at the same time. The distance from home to school is 1400 meters. The older brother rides a bicycle at 200 meters per minute, and the younger brother walks at 80 meters per minute. On the way, the younger brother met the older brother who had just arrived at school and returned. Question: How many kilometers away was my brother from school when we met?
兄弟二人同时从家里出发到学校去．从家到学校相距1400米，哥哥骑自行车每分钟行进200米，弟弟步行每分钟走80米．弟弟在行进中与刚到校就返回的哥哥相遇．问：相遇时弟弟距离学校还有多少千米？
<gadget id="calculator">200 + 80</gadget>
<output>280</output>

<gadget id="calculator">2 / 280</gadget>
<output>1/140 = around 0.007143</output>

<gadget id="calculator">1_400 * (1/140)</gadget>
<output>10</output>

<gadget id="calculator">80 * 10</gadget>
<output>800</output>

<gadget id="calculator">1_400 - 800</gadget>
<output>600</output>

<result>600</result>