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

+1 vote
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If you have an 11 minute and 13 minute hourglass, how can you accurately time 15 minutes?
posted Jun 16, 2014 by Vikram Luthra

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I have two sand hourglasses:
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? + ? + ? + ? + ? = 30

You have to fill numbers in place of question marks. The numbers that you can use are 1, 3, 5, 7, 9, 11, 13 and 15. You can repeat the numbers if you like.

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