Field sowing

One tractor would sow the field in 3 hours and the other in 7 hours. How long before the fields grow together?

Final Answer:

t =  2.1 h

Step-by-step explanation:

t (31+71)=1  t (1/3+1/7)=1  10t=21  t=1021=2.1  t=1021=2.1=2.1 h



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