What building has the most stories?

what does the below rebus means?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?