Related rates, boat being pulled into a dock. Calculus?

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andymcl2000

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A boat is pulled into a dock by a rope attached to the bow of the boat and passing through a pulley on the dock that is 1 m higher than the bow of the boat.

If the rope is pulled in at a rate of 1.5 m/s, how fast is the boat approaching the dock when it is 9 m from the dock?
 
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