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Always add rates!
Convert each of those times to a job-per-time rate.
Rate A = 1/5
Rate B = 2/15

Combined = 1/5 + 2/15 = 3/15 + 2/15 = 5/15 = 1/3

The combined rate is 1 job in 3 hours, so it takes them 3 hours for 1 job.

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