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?

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) (Show Source): You can put this solution on YOUR website!
Billy's rate is JOBS/HOUR, and if Allen works five times faster, then he has a rate of JOBS/HOUR.

their combined rate working together is , in JOBS per HOUR.

, which is HOURS for ONE JOB.
1 hour 20 minutes
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