Fields go plow two tractors with various performances. The first tractor plows the whole field in 11 hours, the second tractor plows the whole field 19 hours longer.

How long take plow the whole field with two tractors?

Correct answer:

t =  8.0488 h

Step-by-step explanation:

t•(1/11 + 1/30) = 1

41t = 330

t = 330/41 ≈ 8.04878

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