Two companies

The company A is able to fulfill the order in 12 days, company B the same order in 18 days. In 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 companiestwo?

Correct result:

t =  8


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=8

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