Answer:
3 days
Step-by-step explanation:
okay well first you have know how many meters are in a kilometer
1 km = 1000m
so in one day, kali runs 10 laps, 400 meters each lap:
10 × 400 = 4000 = the amount of meters she runs in a day
4000/1000 = 4 = the amount of meters she runs in a day
12/4 = 3
so it will take kali 3 days to run 12 kilometers
