If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

Can you divide the below-given shape into four equal and identical pieces?

Steffi's daughter Jazelle needs to be picked up from school every day.
Steffi asks one of her colleagues to pick up Jazelle from the school. Steffi devised a password system to confirm that Jazelle goes with the correct colleague only.

The password on Monday was SJM16.
The password on Wednesday was TAW39.

What will the password be for Friday?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

The answer I give is yes, but what I mean is no. What was the question?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?