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?

Give it food and it will live; give it water and it will die.

Which point will the car reach to go out?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

I don't get anymore wetter, no matter how much rain falls on me.

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

What have one eye but still cannot see?