What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?

What is the Surname of Barbie Doll?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

You are playing as white and given four rooks to checkmate the black king in four moves with the following rules 1. You can place one rook every move and ensure the black king should be in check position.2. After four moves the black king should be in the checkmate position.

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat