Minutes

The 15 Minutes Recipe

Riddle:

A recipe requires 15 minutes to cook. You have a 7 minutes hourglass and an 11 minutes hourglass with you. How will you measure 15 minutes using them?
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The Hourglasses

Riddle:

If you have an 11 minute and 13 minute hourglass, how can you accurately time 15 minutes?
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