Tractors

Fields go plow two tractors with various performances. The first tractor plows the whole field in 14 hours. The second tractor plows the whole field 8 hours déle.

How long does it take to plow the whole field with two tractors?

Final Answer:

t =  8.5556 h

Step-by-step explanation:

t (141+221)=1  t (1/14+1/22)=1  18t=154  t=18154=8.55555556  t=9778.555556=8.5556 h



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