One combine

One combine harvester can harvest a field of corn in 4.5 hours. Another harvester can harvest the same field in 3 hrs. If the farmer uses the two harvesters at the same time. How long will it take to harvest the entire field?

Correct answer:

t =  1.8 h

Step-by-step explanation:

t1=4.5 h t2=3 h  t (t11+t21)=1  f=t11+t21=4.51+31=950.5556 1/h  t f = 1  t=1/f=1/0.5556=1.8 h



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