What's the best place to go shopping in the ocean?

Imagine you are in a room with no windows or doors. How will you get out?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Find the number of squares in the below picture

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

What is full of holes but still holds water?

What two things can you never eat for breakfast?