1. From the edge of a dock 12 feet above the surface of the water, a rowboat is being hauled in by a rope at the rate of 4 ft/sec. How fast is the length of rope changing when the boat is 5 ft from the dock?
   
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2. A rectangular pool is 12 feet long, 8 feet wide, and 10 feet deep. The pool is being filled with water.  If water is entering the pool at the rate of 3 cubic feet per second, how fast is the level of the water rising?
   
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