Xiaoqiang and Xiaodong go from school to the Children's Palace. Xiaodong walks first for 5 minutes. Xiaoqiang catches up with Xiaodong in 25 minutes. If Xiaoqiang walks 5 meters more per minute, Xiaoqiang can catch up with Xiaodong in 20 minutes. How many meters does Xiaodong walk per minute?
小强和小冬从学校往少年宫，小冬先走5分，小强出发25分追上小冬，如果小强每分多走5米，小强用20分就可以追上小冬．小冬每分走多少米．
<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">25 / 20</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">25 + 5</gadget>
<output>30</output>

<gadget id="calculator">30 / 25</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(5/4) - (6/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">5 / (1/20)</gadget>
<output>100</output>

<result>100</result>