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I have two sand hourglasses: 1. A 7 minute one and 2. An 11-minute one. Using just these 2 sand hourglasses............

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I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?

posted Mar 25 by Simranjeet Singh

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