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September 21, 2014

September 21, 2014

Posted by **Anonymous** on Thursday, May 17, 2012 at 10:31am.

- algebra -
**Steve**, Thursday, May 17, 2012 at 11:24amJ can stack 400 lbs in 2*400/130 = 6.15 hrs

B can stack 400 lbs in 3*400/150 = 8 hrs

1/X = 1/6.15 + 1/8

X = 3.48

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