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 5 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 4 additional kilometers per day. After a while, the two groups will
have painted the same amount of the bridge. How much of the bridge will each group have
painted? How long will that take?