Write a system of equations to describe the situation below, solve using any method, and fill in the blanks. Two groups of workers are painting a bridge in the bay. The first group is responsible for painting the north side of the bridge, and the second group is responsible for painting the south side of the bridge. The first group has already painted 3 kilometers of the bridge and is painting 2 additional kilometers per day. The second group has already painted 1 kilometer of the bridge and is painting 3 additional kilometers per day. After a while, the two groups will have painted the same amount of the bridge. How long will that take? How much of the bridge will each group have painted?

In ___days, both groups of workers will have painted ___kilometers of the bridge.