When school was over in the afternoon, my elder brother and younger brother walked home from school at the same time. The younger brother takes 15 minutes to get home, the older brother walks 20 meters longer than the younger brother every minute, and arrives home 5 minutes earlier than the younger brother, find the distance between the school and home.
下午放学时，哥哥和弟弟同时从学校步行回家．弟弟用15分钟到家，哥哥每分钟比弟弟多行20米，比弟弟提前5分钟到家，求学校与家之间的距离．
<gadget id="calculator">10 * 20</gadget>
<output>200</output>

<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<gadget id="calculator">200 / 5</gadget>
<output>40</output>

<gadget id="calculator">40 * 15</gadget>
<output>600</output>

<result>600</result>