Riddle: If you have two hourglasses -- one four-minute timer and one seven-
minute timer, how can you measure nine minutes?
Answer: Turn 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 been running for one
minute. Now turn over the seven minute timer back over. When the
timer runs out, nine minutes have elapsed.
Two Hourglasses Riddle Meme.
Two Hourglasses Riddle Meme.
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