Xiao Ming and Xiao Qiang run a 200-meter race. Xiao Qiang reaches the finish line first. At this time, Xiao Ming is still 20 meters away from the finish line. It is known that Xiao Qiang spent 20 seconds. How many meters does Xiao Ming run per second?
小明和小强进行二百米赛跑，小强率先到达终点，这时小明离终点还有20米，已知小强用了20秒，那么小明每秒跑多少米？
<gadget id="calculator">200 - 20</gadget>
<output>180</output>

<gadget id="calculator">180 / 20</gadget>
<output>9</output>

<result>9</result>