A boat leaves a port traveling due east at 18 mi/hr. At the same​ time, another boat leaves the same port traveling northeast at 17 mi/hr. The angle θ of the line between the boats is measured relative to due north​ (see the figure to the​ right). What is the rate of change of this angle 30 min after the boats leave the​ port? 2 hr after the boats leave the​ port?

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