16км9м+16км991м

To add the two distances together, we first need to convert both measurements to the same unit. Let's convert them both to meters:

16 km 9 m = 16,000 m + 9 m = 16,009 m 16 km 991 m = 16,000 m + 991 m = 16,991 m

Now, we can add the two distances together: 16,009 m + 16,991 m = 33,000 m

Therefore, the sum of 16 km 9 m and 16 km 991 m is 33 km.