Minutes

Google Riddles - The Sand Clocks

Riddle:

You have a 4 minute sand clock and a 7 minute sand clock, you need to measure 9 minutes while using both of them. What's your first move? (The 'Google Riddles' are interview questions those who wish to get hired were asked).
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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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