You run at \(4 \mathrm{~m} / \mathrm{s}\) in the same direction as a river flowing at \(2 \mathrm{~m} / \mathrm{s}\). This speed is enough to keep you chatting with your friend who is steering a slow boat on the river. How fast is your friend going? How fast should your friend go, and in what direction, if the river suddenly speeds up to \(3 \mathrm{~m} / \mathrm{s}\) ?