What has no start, end, or centre?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

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.