Question: 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

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 $3 \mathrm{~m} / \mathrm{s}$ ?

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