SOLUTION: How can you measure 13 minutes exactly with a 5-minute, 7-minute, and 11-minute hourglass? Show or explain how you got your answer.
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Question 596790: How can you measure 13 minutes exactly with a 5-minute, 7-minute, and 11-minute hourglass? Show or explain how you got your answer. Answer by solver91311(24713) (Show Source):
Start both the 5 and 7 minute timers. When the 5 minute timer runs out, start timing the 13 minute interval. 2 minutes later when the 7 minute timer runs out, start the 11 minute timer. When the 11 minute timer runs out, you will have timed 2 minutes plus 11 minutes = 13 minutes.
John
My calculator said it, I believe it, that settles it
