Question

a2+b2=c2?

Answer 1

If her hands were exactly at the same level as the boat, it would be approaching at 2ft/sec. The fact there's an angle means part of the effort is being used to move the rope UP towards her hands.
The answer must be less than 2ft/sec.

Answer 2

The speed with which its being pulled is a vector in the same direction as the 25 feet of rope left. So you can use similar triangles.
x/2=10/25 Next since what you actually want is the opposite side of the triangle
sqrt(2^2-x^2)=1.833 is the real approaching speed.