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January 27, 2015

January 27, 2015

Posted by **Charlie** on Thursday, October 25, 2007 at 8:51pm.

- math -
**Reiny**, Thursday, October 25, 2007 at 11:15pmTo fill the whole tub with the water running and the drain open would take

tub/(tub/4 - tub/5)

= 20 minutes

But the tub was already half full, so it would take 10 minutes to fill from the moment it was half-full.

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