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March 2, 2015

March 2, 2015

Posted by **Anonymous** on Saturday, January 21, 2012 at 4:06am.

- algebra -
**Reiny**, Saturday, January 21, 2012 at 9:36amRate of A = 60 nails / 20 sec = 3 nails/sec

rate of B = 50 nails / 10 sec = 5 nails/sec

combined rate = 8 nails/sec

time at combined rate = 400/8 seconds

= 50 seconds

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