Hour glass optimized solution

havent got what’s the logic behind the optimized solution

Hey Srijeet, you first turn on both glasses, so when one glass goes off, time remaining in other glass is 4 minutes(11-7), now when this 4 minutes are over, again turn on the glass with 11 minutes, so now you measured 15 minutes(4+11), total time taken to measure 15 minutes is 22 minutes.(as you waste 7 mins at starting to measure 4 minutes)

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