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January 30, 2015

January 30, 2015

Posted by **patel** on Friday, October 21, 2011 at 8:38am.

- maths -
**drwls**, Friday, October 21, 2011 at 8:42amNet rate of fillup = 1/3.5 - 1/4.2 tanks/h = 0.04762 tanks/h

Time to fill = 1 tank/0.04762 tank/h

= 21 hours

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