You have two hourglasses, a 7 minute one and an 11 minute one. Using just these two hourglasses, how can you accurately time 15 minutes?
Riddle AnswerHard Riddles
3 Hats Puzzle
Three wise men are told to stand in a straight line, one in front of the other. A hat is put on each of their heads. They are told that each of these hats was selected from a group of five hats: three black hats and two white hats. The first man, let’s call him A, at the rear, can see both other men and their hats. The second man, B, in the middle, can see only the last man and his hat. The last man, C, standing at the front of the line, can’t see either of the men behind him or their hats.
None of the men can see the hat on his own head.
When A is asked if he knows the color of the hat he is wearing, he says no. When B is asked if he knows the color of the hat he is wearing he says no. When C is asked if he knows the color of the hat he is wearing he says, “Yes, my hat is black.”
He is correct. How did he come to this conclusion?
Riddle AnswerTwo Trains Puzzle
A nonstop train leaves Moscow for Leningrad at 60 miles per hour. Another nonstop train leaves Leningrad for Moscow at 40 miles an hour. How far apart are the trains 1 hour before they pass each other?
Riddle AnswerBook Price
Schoolboy’s Route
Each morning Boris walks to school. At one-fourth of the way he passes the machine and tractor station; at one-third of the way, the railroad station. At the machine and tractor station its clock shows 7:30, and at the railroad station its clock shows 7:35.
When does Boris leave his house, when does he reach school?
Riddle Answer