Question

Asked Nov 15, 2019

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A lighthouse is located on a small island 4 km away from the nearest point *P* on a straight shoreline and its light makes seven revolutions per minute. How fast is the beam of light moving along the shoreline when it is 1 km from *P*?

Step 1

Let *y* be the distance of lighthouse from nearest point on the shoreline and at time *t*, the beam light at a distance of *x* km from...

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