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Riddle:

How can you measure nine minutes with have two hourglasses, one four minute and one seven minute?

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.

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How do you measure nine minutes with two hourglasses? Riddle Meme.
How do you measure nine minutes with two hourglasses? Riddle Meme with riddle and answer link.
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