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How you will measure 9 minutes from a 4 minutes hourglass and a 7 minutes hourglass?

+1 vote
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posted Jun 29, 2017 by Sisir Jana

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1 Answer

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Timing and steps below describe how to achieve 9 mins:

0 min- start both hourglasses
4 min- flip 4 min hourglasses when 4 mins over
7 min- start timing when 7 mins over- 4 min hourglass has 1 min left
8 min- flip 4 min hourglass- got 1 min
12 min- flip 4 min hourglass- got 5 min
16 min- 4 mins over- end timing- got 9 mins

answer Jul 14, 2018 by Hanifa Mammadov
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