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

What is so fragile that saying its name breaks it?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Can you place six X (crosses) in below board without making three in a row in any way ?

What is at the end of a rainbow?

What does this simple rebus mean?