Can you find the missing piece of the Porsche?

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?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

I know a nine-letter word having only one vowel.
Do you ?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

Which is the correct shadow of the bird?

I make two people out of one. What am I?

What word begins and ends with an E, but has only one letter?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?