Question
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?
Answers
bobpursley
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.
Amanda rate 5 acres/6hrs or 5/6 acre/hr
so, her time for one acre is 6/5 hour.
Steve
Where did the 5 come from? Amanda planted 2 acres, while Dan planted 1.
1/2 = 1/A + 1/6
A = 3
1/2 = 1/A + 1/6
A = 3
bobpursley
You are right, I need to wear glasses at my computer.
In those six hours, Dan planted one acre, so Amanda planted two.
In those six hours, Dan planted one acre, so Amanda planted two.