Lele leaves home for school at 7:00 every morning and arrives at school at 7:20. One day, Lele left home at 6:55, he thought: "I leave early today, I can walk slowly." So he walked 10 meters less than usual every minute, and as a result, he arrived at school 5 minutes later than usual ． How far is Lelejia from the school?
乐乐每天早上7：00从家出发上学，7：20到校．有一天，乐乐6：55就从家出发，他想："我今天出门早，可以走慢点．"于是他每分钟比平常少走10米，结果他到校时比往常迟到了5分钟．乐乐家离学校多少米？
<gadget id="calculator">10 * 20</gadget>
<output>200</output>

<gadget id="calculator">10 * 5</gadget>
<output>50</output>

<gadget id="calculator">200 + 50 + 50</gadget>
<output>300</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 20</gadget>
<output>1</output>

<gadget id="calculator">(1/20) * 5</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) - 1</gadget>
<output>-3/4 = around -0.75</output>

<gadget id="calculator">1 + (1/4) + (-3/4)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">300 / (1/2)</gadget>
<output>600</output>

<result>600</result>