what does this picture(rebus) riddle means ?

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

Can you spot the hidden girl in the picture below?

Solve the mathematical equation in the picture below.

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

There was a strange boy who was born before his father. How can this be possible?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?