The Hourglasses Riddle
If you have two hourglasses -- one four-minute timer and one seven-minute
timer how can you measure nine minutes?
Show / Hide AnswerTurn over both hourglasses at once.When the four-minute hourglass runs out
turn it over.When the seven-minute hourglass runs out turn it over.When
the four-minute timer runs out this time (eight minutes have elapsed) the
seven-minute hourglass has be
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