Two companies

Company A can fulfill the order in 12 days, and company B the same order in 18 days. How many days will the order be fulfilled if only company A works on it for the first two days, then the remaining days for both companies?

Correct answer:

t =  8

Step-by-step explanation:

a=12 d b=18 d  2 (1/a)+(t2) (1/a+1/b)=1 2 (1/12)+(t2) (1/12+1/18)=1  5t=40  t=540=8  t=8

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