It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

If an electric train is travelling south, then which way is the smoke going?

What building has the most stories?

John was piloting a plane behind a car but was never able to overtake it. Why?

Name a key which is hardest to turn.

Why did Navjot Singh Sidhu put the new January calendar in the freezer

What is common among 11, 69, and 88?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

A farmer and his neighbour once went to Emperor Akbar"s court with a complaint. "Your Majesty, I bought a well from him," said the farmer pointing to his neighbour, "and now he wants me to pay for the water."
"That"s right, your Majesty," said the neighbour. "I sold him the well but not the water!"?
The Emperor asked Birbal to settle the dispute. How did Birbal solve the dispute?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?