Tractors

Two tractors plow the field in 4 hours together. If the first tractor plow half of the field and then the second tractor completed the job, it would take 9 hours. How many hours does the field plow for each tractor separately?

Result

a =  12 h
b =  6 h

Solution:

Solution in text a =
Solution in text a = : Nr. 1

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Solution in text b =







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