Each interval is $600\div2=300$ m. There are $9-1=8$ intervals in total, so the bus route\textquotesingle s length is $300\times8=2400$ m. 
Nine bus stops are equally spaced along a certain bus route. The distance between the first stop and the third stop is $$600$$ m. How long is the bus route? ($$2004$$ Math kangaroo Problem, Level $$5-6$$, Question \#$$9$$) 
1: $$1800$$ m 
2: $$2100$$ m 
3: $$2400$$ m 
4: $$2700$$ m 
5: $$3000$$ m 