Tractors 19713

Two tractors are working on plowing the field. If only the first tractor plowed, it would plow the field in 3 hours. The second tractor would plow the field by itself in 6 hours. How long will it take to plow if they work together, but the other starts work 2 hours later?

Correct answer:

t =  2.6667 h

Step-by-step explanation:

a=3 h b=6 h  t/a+(t2)/b=1 t/3+(t2)/6=1  3t=8  t=38=2.66666667  t=382.666667=2.6667 h



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