Working together, alex and millie can file all the papers in the file cabinets in 4 hours. it would have taken alex 6 hours to do the job alone. what is the missing value in the table that represents the part of the papers that alex would file if alex and millie worked together?

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The set up is normally
t/A + t/B = 1 (as in 1 job)

Here you are given t, the time worked together, and A, Alex's alone time...now we need to find B, Millie's alone time...so
4/6 + 4/B = 1
B turns out to be 12...which means
Alex did 2/3 the job and Millie did 1/3

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