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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?

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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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Р. х ө L

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