The Two Hourglass Timers

1,742 solved 53% solve rate 47% fail rate

7-minute hourglass and 11-minute hourglass. How do you measure 15 minutes exactly?

Only 53% solve this correctly

1,742 attempts

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Quick Answer & Explanation

Flip together twice

The answer to this riddle is Flip together twice. Difficulty: Hard · Solved by 1,742 puzzle lovers.