Five tractors

Five tractors plow the fields in 4.8 hours. How long will it take to plow the field when, after an hour and a half of work, two tractor drivers have been called up for another task?

Correct answer:

x =  7 h

Step-by-step explanation:

5 4.8=1.5 5+(x1.5) (52)  3x=21  x=321=7  x=7=7 h

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