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A lighthouse stands 550 m off a straight shore and the focused beam of its light revolves four times each minute. As shown in the

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A lighthouse stands 550 m off a straight shore and the focused beam of its light revolves four times each minute. As shown in the figure, P is the point on shore closest to the lighthouse and Q is a point on the shore 350 m Lighthouse . from P. What is the speed of the beam along the shore when it strikes the point Q? 550 m TO - 350 m

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