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

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

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

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

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

A man is lying dead in a field where no one is around. His head is split open and his legs are disfigured. Near to him, there is an unopened package. No living organism can be found anywhere at the crime scene.

How did he die?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

How many letters are in the alphabet?

By what process could you make a 'Tea-Table' into food?

Count the number of triangles in the given picture.