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A lighthouse stands 425 m425 m off a straight shore and the focused beam of its...

A lighthouse stands 425 m425 m off a straight shore and the focused beam of its light revolves threethree 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 175 m175 m from P. What is the speed of the beam along the shore when it strikes the point​ Q? Describe how the speed of the beam along the shore varies with the distance between P and Q. Neglect the height of the lighthouse.

Math   Calculus   
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