SOLUTION: using 2 tractors a farmer can plough a piece of land in 10 days .The farmer uses 2 tractors for the first 4 days and then hires a third tractor.How many days does it take to plough

Question 1094216: using 2 tractors a farmer can plough a piece of land in 10 days .The farmer uses 2 tractors for the first 4 days and then hires a third tractor.How many days does it take to plough the piece of land.
Answer by josgarithmetic(39630) (Show Source): You can put this solution on YOUR website!
r, work rate for 1 tractor
x, number of days using 3 tractors ("one more tractor")

4 days with 2 tractors and then 4 days with 3 tractors;
total of 8 days.
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