A few puzzles to tax the brain......

See also our Web-based puzzles

No.1 - The Trains

 Ok...Point A and B are 200 miles apart.A train leaves point A travelling at 50 mph...

At exactly the same time a bird leaves point B travelling at 100mph. The bird flies until he meets

the train and then turns and flies back to B, turns and flies back to the train etc..

until both are at point B.

What is the total distance covered by the Bird??

No.2 - The Hats

OK....4 men have been captured and buried upto their necks in sand (they can't turn their heads at all)

They have been told that 2 are wearing Black hats and 2 are wearing white hats but they do not know their own (or anyone elses) colour.

There is a brick wall between A and B...so D can see B+C and C can see B...A and B can see no-one.

They may not speak or communicate in any way.

They will be shot in 7 minutes if one of them doesn't shout out the colour of his hat and how he knows.

After 2 minutes one shouts out correctly.

Who and how did he know???

(No gimmicks...mirrors or anything are required)