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Shown in the picture there are 4 men buried up to their necks in the ground.
They cannot move but can only look (see) forward. Between A and B is a brick wall which cannot be seen through.
They all know that between them they are wearing hats, 2 black and 2 white, but they do not know what colour they are wearing.
10 mintues time given to them so that one of the person should shout what color hat A is wearing. If he gets it wrong, all 4 will be shot dead.
They are not allowed to talk to each other
After couple of minutes, one of them calls out and he had the right answer. All four were saved.
Question: Which one of them calls out and how did he get the right answer.
There are no outside influences nor other ways of communicating. They cannot move and are buried in a straight line.
Clue : A & B can only see their respective sides of the wall, C can see B, and D can see B & C
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