이것좀 푸는데 도와주세요;;
영문 문제입니다

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1. A boat is being pulled toward a dock by means of a rope attached to the front tip of the bow.  Initially there are 30 feet of rope out and the rope is taught and being reeled in by a circular device the top of which is 10 feet higher than the point where the rope is attached to the boat.  This circular device has a radius of 1 foot and turns at the rate of one revolution every pi seconds.  How fast is the boat moving along the water when there are 15 feet of rope out?  Click here for animation.  < -- 보시려면 여기 이 주소로!!    http://www2.scc-fl.com/lvosbury/images/DockBoat.gif



2. Water flows at 8 cubic feet per minute into a cylinder with radius 4 feet.  How fast is the water level rising when the water is 2 feet high?  Answer should be expressed in terms of feet per minute.



3. The dimensions of a box are 10 in, 12in, and 16 in. If the shorter sides are decreasing at the rate of 0.2 in per minute, and the longest side is increasing at the rate of 0.3 in per minute, how fast is the volume changing?