Question 253610: Tractors A,B,C and D are identical and are pulling identical planting machines. Working together, A,B and C can plant 180 acres of corn in 2 hours. At this rate, how many acres can A,B,C,and D all working together, plant in 3 hours?
Answer by richwmiller(17219)   (Show Source):
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They each plant 60 acres in 2 hours
So they plant 30 acres in one hour
All four can plant 4*30*3=360 in 3 hours at 30 acres an hour.
We doubled the work done by adding a new machine and adding an hour.
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