Tractors

Five tractors will plow the field for 8 hours. In 2 hours, one tractor broke down. How long do the remaining tractors complete the plow?

Correct answer:

t =  7.5 h

Step-by-step explanation:


5·8 = 5·2 + (5-1)·t

4t = 30


t = 30/4 = 7.5

t = 15/2 = 7.5

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