How can you take 2 from 5 and leave 4?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Find the hidden panda in the image below.

What Time Should the last watch show in the below figure?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

If eleven plus two equals one, what does nine plus five equal?