Xiao Ming runs along a road at the same speed. There is a row of street light poles with the same distance on the side of the road. It takes Xiao Ming 9 minutes to run from the first pole to the tenth pole. Then when Xiao Ming runs for 30 minutes , How many electric poles should he run to?
小明以相同的速度沿着一条马路跑步，路边有一排间隔距离相同的路灯电杆，小明从第1根电杆跑到第10根电杆共用了9分钟，那么当小明跑了30分钟时，他应该跑到第多少根电杆．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 / 9</gadget>
<output>1</output>

<gadget id="calculator">30 / 1</gadget>
<output>30</output>

<gadget id="calculator">30 + 1</gadget>
<output>31</output>

<result>31</result>