Measure 9 minutes from 2 hourglasses puzzle
Using only a Four-minute hourglass and a seven-minute hourglass,
How will you measure exactly nine minutes?
Restriction:- Without the process taking longer than nine minutes.
We measure 7 Minute from One Hourglass. We reverse it at 7th minute
And, 4+4=8 Minutes from Second Hourglass – 8 Minutes
8(from 1)-7(From 2) = 1 Minute – 1 Minutes
TOTAL = 9 MINUTES
EXPLANATION-
0 Minutes – Start both hourglass at the same time.
4 Minutes – The four minute glass runs out. 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.
Exactly what i thought
start the 2 clocks.
After 4 minutes, flip the 4-minute clock over.
after 7 minutes flip the 7 minute clock.
After 8 minutes, the sand ended on the 4 minute clock for the second time,
which means that a minute passed on the 7 minute clock. Flip back and we got 9 minutes.
Your Answer
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