Five-blade 27091

Tractor operator Formánek can plow Mr. Kafka's land in 30 hours using a plowing set with a four-blade plow. The tractor driver Divíšek, plowing with a five-blade plow, can plow Kafka's land in 24 hours. In how many hours will the two tractor drivers plow these plots together?

Correct answer:

t =  13.3333 h

Step-by-step explanation:

T1=30 h T2=24 h  t (1/T1+1/T2)=1 t (1/30+1/24)=1  9t=120  t=9120=13.33333333  t=34013.333333=13.3333 h



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