$(11-1)\times5=50$ 
There are $$11$$ flags on one side of a road. The distance between neighboring flags is $$5$$ meters. Grace walked from the first flag to the last flag. How many meters did she walk? (Adapted from 2007 Math Kangaroo Problem, Level 3-4, Question \#5) 
1: $$45$$ 
2: $$50$$ 
3: $$55$$ 
4: $$65$$ 
5: $$75$$ 