Twelve flags stand equidistant along the track at the stadium. The runners start at the first flag

Math Riddle:  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?

Answer: The correct answer is not 12 seconds.

There are 7 segments from the first flag to the eighth, and 11 from the first to the twelfth.

He runs each segment in 8/7 seconds; therefore, 11 segments take 88/7= 12 4/7 seconds.

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