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March 3, 2015

March 3, 2015

Posted by **Bob** on Thursday, December 20, 2012 at 3:51am.

- math -
**drwls**, Thursday, December 20, 2012 at 4:07amUp rate on the down escalator = 80 - 60 = 20 step/min. Time spent going up one level = 50/20 =2.5 minutes

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