How Do You Measure Nine Minutes With Two Hourglasses?

Author: Anonymous
8 years ago

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.
VOTE
Source: https://www.riddles.com/556
COMMENT
How can you measure nine minutes with have two hourglasses, one four minute and one seven minute?
How do you measure nine minutes with two hourglasses? by Anonymous v1.


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.
by Anonymous v2.