Twelve flags stand equidistant along the track at the stadium. The runners start at the first flag. A runner reaches the eighth flag 8 seconds after he starts. If he runs at an even speed, how many seconds does he need altogether to reach the twelfth flag?
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Two 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?
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10 Chairs 4 Walls
In a rectangular dance hall, how do you place 10 chairs along the walls so that there are an equal number of chairs along each wall?
Riddle AnswerTroubling Doubling at School
In a class, the number of girls who do wear a watch is double the number who don’t. But the number of boys who do not wear a watch is double the number who do.
If I tell you the number of girls in my class is double the number of boys, Can you tell me the number of students I teach? Here’s a clue: More than 20; below 32.
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