Can you place six X (crosses) in below board without making three in a row in any way ?

Client Dempsey living in one of the East Coast states of the U.S. was talking to Landon Donovan, who was living in the West Coast state of the U.S.

Dempsey: What time is it?
Donovan: Wow, It is the same time here.

How is this possible?

What is the next number in the series?

15 29 56 108 208 ?

Christina makes tasty toast in a small pan. After toasting one side of a slice, she turns it over. Each side takes 30 seconds. The pan can only hold two slices.
How can she toast both sides of three slices in 1 & 1/2 instead of 2 minutes?

My location can be determined by the below rebus.
So where am i ?

In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

How many squares, of any size, can you find on this chessboard which do not contain a Rook?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?