Posted by **MAnny** on Friday, June 22, 2012 at 2:19pm.

Daniel can plant an acre of corn in 6 hours. Working with Amanda, they can plant an acre of corn in 2 hours. How long would it take in hours for Amanda to plant an acre of corn by herself?

- algebra -
**bobpursley**, Friday, June 22, 2012 at 3:07pm
in six hours, they plant three acres (an acre each 2 hrs). But in those six hours, Dan planted one acre, so Amanda, the speedster, must have planted 5 acres.

Amanda rate 5 acres/6hrs or 5/6 acre/hr

so, her time for one acre is 6/5 hour.

- algebra - Hmmm -
**Steve**, Friday, June 22, 2012 at 4:07pm
Where did the 5 come from? Amanda planted 2 acres, while Dan planted 1.

1/2 = 1/A + 1/6

A = 3

- algebra -
**bobpursley**, Friday, June 22, 2012 at 4:49pm
You are right, I need to wear glasses at my computer.

In those six hours, Dan planted one acre, so Amanda planted two.

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