SOLUTION: One man need 2hours to finished the job 2man need 5 hours.How long take both of them fibiahd the job

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Question 468358: One man need 2hours to finished the job 2man need 5 hours.How long take both of them fibiahd the job
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
In 1 hour, the 1st man can do 1/2 the job.
The 2nd man can do 1/5 of the job.
Together, they do 1/2 + 1/5 = 7/10 of the job in an hour.
--> 10/7 hours to do the job