Answer: 3 4/5 km
Step-by-step explanation:
1 1/5 km + 2 3/5 km
1. Add the whole numbers
1 + 2 = 3
2. Solve the fraction parts
1/5 + 3/5 = 4/5
3. Combine the whole number and fraction
3 + 4/5 = 3 4/5
Answer: Jacob and Koleen walked 3 4/5 km together.
hope it helps!! <3