What Time Should the last watch show in the below figure?

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

What does a man do only once in his lifetime, but women do once a year after they are 29?

No matter how little or how much you use me, you change me every month. What am I?

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

If eleven plus two equals one, what does nine plus five equal?

I don't get anymore wetter, no matter how much rain falls on me.

Solve the rebus riddle in the picture below.

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