What does Alexander the Great and Winnie the Pooh have in common?

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?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

What is the coolest letter in the alphabet?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

A father's child, a mother's child, yet no one's son.

Who am I?

Can you spot the man between the coffee bean in the picture below ?

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?