Why Aeroplane windows are round?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

What 5-letter word typed in all capital letters can be read the same upside down?

A girl was sitting in her hotel room when she heard a knock on the door. She opened the door and found that a man was standing outside.
The man said, "Oh! I am really sorry, I thought this was my room."
He then walked through the corridor to the elevator. The girl did not know the man. She closed her door and called security asking them to apprehend the man.
What made her suspicious of that man? He might have been genuinely mistaken.

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____

Identify the 10 differences between the two given pictures.

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

Count the number of squares in the picture below.