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

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

How many times in a given day, minutes and hour clock comes in a straight line ?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

Imagine you are in a room with no windows or doors. How will you get out?

What work can one never finish?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?