Tractors

Two tractors with different capacities are to plough a field. The first tractor can plough the entire field in 14 hours. The second tractor can plough the entire field 8 hours déle.

How long does it take both tractors to plough the entire field working together?

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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