What does this below rebus puzzle mean?

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

What brings you down but never up?

What is full of holes but still holds water?

What do you get if you add 2 to 100 four times?

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

What part of Turkey has the most feathers?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

By what process could you make a 'Tea-Table' into food?