Niko runs 6 miles a day and 3 days a week how many weeks will it take Niko to run 198 miles
If Niko runs 6 miles a day and 3 days a week, then he runs 6*3 = <<6*3=18>>18 miles in a week.
So, it will take Niko 198/18 = <<198/18=11>>11 weeks to run 198 miles. Answer: \boxed{11}.