SOLUTION: Allen can do a job 5 times faster than Billy. Billy can do the same job in 8 hours. How long will it take to do it together?

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Question 1026382: Allen can do a job 5 times faster than Billy. Billy can do the same job in 8 hours. How long will it take to do it together?
Answer by josgarithmetic(39613) About Me  (Show Source):
You can put this solution on YOUR website!
Billy's rate is 1%2F8 JOBS/HOUR, and if Allen works five times faster, then he has a rate of 5%2F8 JOBS/HOUR.

their combined rate working together is 1%2F8%2B5%2F8, in JOBS per HOUR.

%283%2F4%29%2A%28jobs%2Fhour%29, which is 4%2F3 HOURS for ONE JOB.
1 hour 20 minutes