SOLUTION: Two digging crews are competing for a job the first team shows they can dig a foundation pit in 4 days the second crew takes 5 days to do the same job the project manager suggest t

Question 973677: Two digging crews are competing for a job the first team shows they can dig a foundation pit in 4 days the second crew takes 5 days to do the same job the project manager suggest that they were together instead of offering to pay both crews if it will shorten the time frame how long would it take both crews to dig 18 foundation pits.
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
1/4 jobs per day crew
1/5 jobs per day crew

18 jobs wanted; how many days using the two crews at the same time?

RT=J rate time quantity of jobs.
Crews working at the same time on the same job work at the sum of their rates.

;
solve for .
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