3 1/5km, or 16/5km. I’m not sure which fraction form you’re looking for, but I gave you both just in case.
.2=1/5
Since .2 is equal to 1/5, your answer must be in fifths. Assuming your answer is an improper fraction:
3 is equal to 15/5, and since it’s 3.2 km, you add 1/5 to that number to get 16/5.