Mina put $$11$$ potted plants in a row from one end to the other end of the corridor.  They were placed at an equal distance from one another.  The distance between the first and the last potted plant was $$30 \text{m}$$.  Later, Mina decided to remove $$8$$ potted plants.  As a result, the remaining potted plants were rearranged from one end to the other end of the corridor at a new equal spacing. Find the new interval between each potted plants. 
Overseas Competition->Knowledge Point->Word Problem Modules->Interval Problems