Water stations will be placed every 400 meters at a 5 kilometer race. How many water stations are needed

If water stations will be placed every 400 meters at a 5 kilometer (=5000 meter) race and you want to know how many water stations are needed, you can calculate this using the following steps:

5 kilometers / 400 meters = 5000 meters / 400 meters = 12.5

Result: They will need 12 or 13 water stations.