Before Mount Everest was discovered, what was the highest mountain in the world?

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?

I have an eye but still cannot see.

Who am I?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

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

Can you solve this picture maths equation?

What is the riddle which can be asked all day with a different correct answer each time.

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

What jumps when it walks and sits when it stands?

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?