If a construction company can construct a $$1000-$$meter highway in $$5$$ days, how many days does it take to construct a $$2600-$$meter highway at the same rate? 
Overseas Competition->Knowledge Point->Word Problem Modules->Unitary Method Problems->Unitary Method with Two Variables
It can construct $$1000\div5=200$$ meters per day.  To construct $$2600$$ meters: $$2600\div200=13$$ days. 