BRAINLIESTTT ASAP! PLEASE HELP ME :)

 18/5 hours, or 3.6 hours

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Work Shown:

x = amount of time it takes Blake to do the job by himself

y = amount of time it takes Ned to do the job by himself

z = time it takes if they worked together

In this case,

x = 9 and y = 6

Use those values to find z.

here is the

mark brainliest pl