Can you make a six-letter word using the letters N, A and B ?

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 does this simple rebus mean?

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

Look at me. I can bring a smile to your face, A tear to your eye, Or even a thought to your mind. But, I can't be seen. What am I?

What do you answer even though it never asks you questions?

My location can be determined by the below rebus.
So where am i ?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?

Which five letter word can be added at the end of below word to form a
valid word?

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Prove that the below maths equation is true.

8 + 8 = 91