How Will You Measure 7 Minutes Using These Two Hourglasses?
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Puzzle: Given two hourglass of 4 minutes and 7 minutes, the task is to measure 9 minutes. At 0 minutes: Start both hourglasses at the same time. At 4 minutes: 4 minutes hourglass runs out and flip it. 7 minutes hourglass is left with 3 minutes. At 7 minutes: 4 minutes hourglass is left with 1 minute. 7 minutes hourglass runs out and flip it.
How long does it take to flip an hourglass?
Puzzle: Given two hourglass of 4 minutes and 7 minutes, the task is to measure 9 minutes. At 0 minutes: Start both hourglasses at the same time. At 4 minutes: 4 minutes hourglass runs out and flip it. 7 minutes hourglass is left with 3 minutes.
Can you add 2 minutes to the end of a 7 minute hourglass?
And there is a solution that allows this. We need to add 2 minutes on to the end of the 7 minute hourglass. Since the twice-flipped 4 minute hourglass will stop at 8 minutes we can flip our 7 minute hour glass here for the second time.
How many minutes is in the four minute glass?
Flip the four minute glass. 7 Minutes – The seven minute glass runs out. Flip the seven minute glass. 8 Minutes – The four minute glass runs out; the seven minute glass has been running for one minute. Flip the seven minute glass. 9 Minutes – The seven minute glass runs out.
James Sterling reports on renewable energy developments, climate policy, ecological conservation, and green tech innovations around the globe.
