I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

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?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

How many bananas can you eat if your stomach is empty?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

What brings you down but never up?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

The more of this there is, the less you see. What is it?

Count the Triangle in the figure given below: