Algebra

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jose can complete the job in a hours, and Maria can complete the job in b hours. How long does it take them to complete the job when they work together? I need a formula

• Algebra -

Jose's rate = job/a
Maria's rate = job/b
combined rate = job/a + job/b
= job(a+b)/(ab)

combined time = job/combined rate
= job/[job(a+b)/(ab)]
= ab/(a+b)

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