If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

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?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

What is black when you buy it, red when you use it, and gray when you throw it away?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

What is so fragile that saying its name breaks it?

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=