(12.221)-Two boats leave the pier P at the same time and travel in the directions shown. If vA = 40 ft/s and....

(12.221)-Two boats leave the pier P at the same time and travel in the directions shown. If vA = 40 ft/s and  vB = 30 ft/s , determine the velocity of boat A relative to boat B. How long after leaving the pier will the boats be 1500 ft apart?

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