Riddle of the Week: The Hourglass Problem
Difficulty level: Moderate
Michael Stilwell
By Jay Bennett
Welcome back to Riddle of the Week. We have a nice short riddle about timekeeping for you this week—but drat, you don't have the correct hourglasses!
PROBLEM
You have an 11-minute hourglass and a 7-minute hourglass. You need to measure exactly 15 minutes. How do you do it?
HINT
There are a couple ways to measure out 15 minutes, however one is more efficient than the other. Can you find them both?
See the solution this Friday
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