Using Only Five 5's and any mathematical operator make sum as 37

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

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

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

Who is He ?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

Find the value of "?" in the ball picture Riddle below:

Can it be possible to build a house that has all its four walls facing towards the South?

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title