Five tractors

Five tractors plow field in 4.8 hours. How long plow this field if after 1.5 hours of work two tractors went to a different field?

Correct result:

x =  7 h



1.5•5/(4.8•5) + (x-1.5)•3/(4.8•5)=1

0.125x = 0.875

x = 7

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