What work can one never finish?

Why do we preferably have round manhole covers and not square ones?

I am a ten letters word
The first four letters have the power to rule,
Next, four-letter can be eaten.
The next three-letter represents a lady.
I can fly as well

what am I looking for?

It is always ahead of me yet I can never see it. What is it?

If a wheel has 54 spokes, how many spaces are there between the spokes?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

With the help clues provided in the image, can you find the 5 digit key?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.