SOLUTION: A father can do a job in 3 days,and his son can do the same job for 5 days.How long will it take them to finish the job if they work together?

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Question 1095127: A father can do a job in 3 days,and his son can do the same job for 5 days.How long will it take them to finish the job if they work together?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
1%2F3%2B1%2F5, unit of job per days

5%2F15%2B3%2F15

8%2F15

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15%2F8=highlight_green%281%267%2F8%29 days for 1 job