Xiao Ming and Xiao Liang practice running. If Xiao Ming asks Xiao Liang to run 10 meters first, then Xiao Ming can catch up with Xiao Liang in 5 seconds. At the same speed, if Xiao Ming lets Xiao Liang run for 2 seconds first, then Xiao Ming can catch up with Xiao Liang by running for 4 seconds. Ask Xiao Ming how many meters he runs per second?
小明和小亮两人练习跑步，如果小明让小亮先跑10米，那么，小明跑5秒钟就可以追上小亮．以同样的速度，如果小明让小亮先跑2秒钟，那么，小明跑4秒钟就能追上小亮．问小明每秒钟跑多少米？
<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<result>6</result>