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Old 01-05-2015, 07:19 AM   #1
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Math problem

I will never pass grade school math.

You need to do a task for 9 minutes; however you only have two hourglasses to utilize. You have a 4 minute hourglass and a 7 minute hourglass. How do you determine with only 9 minutes have passed.

Any thoughts?

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Old 01-05-2015, 07:42 AM   #2
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Start both, flip the 4 min when finished and also flip the 7 min which is now become a 5 min timer when flipped over. Done.
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Old 01-05-2015, 07:51 AM   #3
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Start both timers:
When 4 min timer runs out (4 min total time)turn it over:
When 7 min timer runs out (7 min total time now) turn it over:
When 4 min timer again runs out (8 min total time now) turn 7 min timer over:
When 7 min timer now runs out you have 9 minutes.

All of these are predicated on the assumption that the flow in the timers is constant from start to finish.
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Old 01-05-2015, 07:12 PM   #4
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My head hurts
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Old 01-05-2015, 07:42 PM   #5
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Quote:
Originally Posted by troutslayer View Post
My head hurts

^^^what he said LOL ^^^
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Old 01-05-2015, 08:33 PM   #6
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Check your watch
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Old 01-05-2015, 08:39 PM   #7
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Check your watch
x2
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Old 01-05-2015, 08:41 PM   #8
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Open ice chest. Pop the top. Consume. 9 minutes on a decent day.
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Old 01-05-2015, 10:01 PM   #9
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You have the wrong timepieces to solve the problem.
By definition, an HOURGLASS measures in units of an Hour.
Calling something a 7 minute hourglass is like calling something else a trombone Chevy.

Snowbird 47 did a great job.
I just don't understand eldermike's math.
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Old 01-06-2015, 04:20 AM   #10
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I would just skip that task!
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