A rope passing through a capstan on a dock is attached to a boat offshore. The rope is pulled in at a constant rate of 4f(t)/(s), and the capstan is 5ft vertically above the water. How fast is the boat traveling when it is 9ft from the dock?

A 13 ft ladder is leaning against a wall. If the top of the ladder slips down the wall at a rate of 6 ft/s, how fast will the foot be moving away from the wall when the top is 5 ft above the ground? Enter the exact answer. ft/s

A street light is at the top of a 26 ft pole. A 5 ft tall girl walks along a straight path away from the pole with a speed of 8 ft/sec. At what rate is the tip of her shadow moving away from the light (ie. away from the top of the pole) when the girl is 39 ft away from the pole? Answer: How fast is her shadow lengthening? Answer:

The area of a square is increasing at the constant rate of 16 sq. ft./min. When the perimeter of the square is 36 ft, how fast is the perimeter of the square increasing? I dont know what to do with the perimeter.