What have one eye but still cannot see?

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?

What kind of tree can you carry in your hand?

I have branches, but no fruit, trunk or leaves. What am I?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

A man was going to bleach his socks because they had gotten muddy the day before. As he was pouring the bleach into the washing machine, he spilt some on the floor. He got some cleaning fluid and mopped it up with a rag. Minutes later he was dead. What killed him?

Which point will the car reach to go out?

Which country gets ill every time?

There is something which you can be arrested for attempting but not for successfully completing.

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?