Tom wants to plant some trees along a straight road, with each tree $5\textasciitilde m$ apart from the next. Tom starts planting a tree from the beginning of the road, but the end of the road is blocked by a large stone. If he plants $30$ trees in total, how long is the road? 
Overseas Competition->Knowledge Point->Word Problem Modules->Interval Problems->Planting Trees only on One Side (straight line type)