If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

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

A man was telling some of his war stories to his grandchildren.
"When the World War I was on the verge of end, I was awarded for my bravery for I had saved a group of my men." He coughed and then added, "When we were fighting in northern France, an enemy soldier threw a grenade at us. Before it could explode, I picked it up and threw it away. For my act of bravery, right before the war ended, A General gave me a sword engraved with the words "Awarded for Display of Bravery and Heroism in World War 1"."

Hearing this, one of the grandson spoke up. "Grandpa, this is not a true story. It can"t be true!"

The truth is that it was not. How did the grand children know it?

In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.

Can you count the number of triangles inside a triangle?

John: "Hi Teacher, What is your favourite movie ?".
Chemistry Teacher: "Indium Cerium Platinum Iodine Oxygen Nitrogen".
Ten seconds later... John replied I got it.

Do you?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

Move four matchsticks to the below square to form three squares?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?