Answer:

Step-by-step explanation:
Consider the two kinematic equations for velocity and position of an object falling due to the action of gravity:

Therefore, if we consider
the time for the object to reach point A, and
the time for it to reach point B, then:

Let's work in a similar way with the two different positions at those different times, and for which we have some information;

Notice that this quotient is exactly the square of the quotient of velocities we are looking for, therefore:
