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# A boat is pulled in to a dock by a rope with one end attached to the front of the boat and the other end passing through a ring attached to the dock

A boat is pulled in to a dock by a rope with one end attached to the front of the boat and the other end passing through a ring attached to the dock at a point sqrt(85) feet

higher than the front of the boat. The rope is being pulled through the ring at the rate of

0.1 ft/sec. How fast is the boat approaching the dock when 11 feet or rope are out?

=xxxx ft/sec?