Question: 
One worker can do a job in n hours, while it takes a second worker m hours to do the same job. How long does it take both workers?
1/m + 1/n
m + n
(m + n)/mn
mn/(m + n)
mn/(m + n)
Answer: 
mn/(m + n)
Last Updated: 
08/11/2021 - 03:24