A person walks on the road at a constant speed, and it takes 15 minutes to walk from the first telegraph pole to the 15th telegraph pole. If the person walks at this speed for 30 minutes, he can walk from the first telegraph pole to the No. 1 telegraph pole. ?
一人匀速地在公路上散步，从第1根电线杆走到第15根，用了15分钟，则这人如果按这速度走30分钟可从第1根电线杆走到第几根电线杆处？
<gadget id="calculator">15 - 1</gadget>
<output>14</output>

<gadget id="calculator">14 / 15</gadget>
<output>14/15 = around 0.933333</output>

<gadget id="calculator">(14/15) * 30</gadget>
<output>28</output>

<gadget id="calculator">28 + 1</gadget>
<output>29</output>

<result>29</result>