Zoe is standing on a 6-meter ladder that is leaning against a wall when Jacob begins to pull the bottom of the ladder out away from the wall.

Zoe is standing on a 6-meter ladder that is leaning against a wall when Jacob begins to pull the bottom of the ladder out away from the wall. The bottom of the ladder is pulled at a constant rate of 21 rnisec. How fast is the top of the ladder moving when it is 5 meters up the wall? How fast is the top of the ladder moving when it is 3 meters up the wall? How fast is the top of the ladder moving when it is 1 meter up the wall? 

Explain your answer and draw a picture for this question.