In the sea there are 3 fishers in a boat and they take 4 hours to complete one third of a fish container. They went to rest and were supplanted by 8 fishers. If they continue to fish at the same rate, how many hours will take to all of the fishers complete all the container?  Choose the correct choice from the following answers
A) 16 hours  B) 12 hours  C) 8 hours  D) 7 hours  E) 5 hours
We have that: 3 fishers ----- 4 hours, 8F ----- xhr, that is: (Xhr/ 3F) = (4hr/8F), then: Xhr = (4hr/8F)3F = (3/2)hr. Is to say, they did the same work in 3/2 hours; it is only one third of the container. Then, all the container is: C = C1 + C2 + C3 = 4 hr + (3/2) hr + (3/2) hr = (4 + 3)= 
<gadget id="calculator">(4 + 3)</gadget>
<output>7</output>
7 hr. Answer 7 hours.
<result>D</result>
In the sea there are 3 fishers in a boat and they take 4 hours to complete one third of a fish container. They went to rest and were supplanted by 8 fishers. If they continue to fish at the same rate, how many hours will take to all of the fishers complete all the container?