I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

If eleven plus two equals one, what does nine plus five equal?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

How many letters are in the alphabet?

I’m tall when I’m young, and I’m short when I’m old. What am I?