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January 31, 2015

January 31, 2015

Posted by **Lizzy** on Tuesday, April 10, 2012 at 8:02pm.

- Math -
**Steve**, Wednesday, April 11, 2012 at 12:11pmt = k/r

12 = k/3

k = 36

t = 36/r

when r=4,

t=36/4 = 9 min

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