Just in case you can't read the writing on the attached file it states:
Two monkeys of equal weight are hanging in equilibrium at the ends of a rope passing over a relatively light pulley for which the bearing friction can be neglected. Then the monkey on the right begins to climb the rope while the monkey on the left simply holds on. When the right monkey has raised himself through height h(relative to the floor), what has been the change in the position of the left monkey?
Answer: h, same as right monkey.
Let the left monkey's position changes by h2 with respect to the floor and let the right monkey actually climbed up h1, but because of left monkey went up by ...
The solution is provided with explanation.