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

What is the riddle which can be asked all day with a different correct answer each time.

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

What has many keys but can’t open a single lock?

Take one out and scratch my head, I am now black but once was red. What am I?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

I travel all around the world but always stay in the corner. What am I?

What is the centre of gravity?

Prove that twice of ten is the same as twice of eleven.

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?