Tuesday, May 5, 2009
You have two hourglasses. One times 7 minutes, the other 11. Using just these hourglasses, accurately time 15 minutes.
Solution (Highlight): Flip both the 11 and 7 minute hourglasses over. Once the 7 minute runs out turn it back over. Once the 11 minute hourglass will finishes turn the 7 minute over one more time(4 minutes worth of sand are in the bottom). 11+4 = 15
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