There are 15 telegraph poles erected on the side of the straight road, and the distance between them is 100m. Now it is necessary to only erect 29 electric poles (the electric poles at both ends do not move), how many meters should the interval be changed?
笔直的公路一旁架设了15根电线杆，它们的间隔是100m．现在要改为只架设29根电线杆(两端的电线杆不动)，间隔应改为多少米？
<gadget id="calculator">15 - 1</gadget>
<output>14</output>

<gadget id="calculator">14 * 100</gadget>
<output>1_400</output>

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

<gadget id="calculator">1_400 / 28</gadget>
<output>50</output>

<result>50</result>