SOLUTION: carrie can inpsect a case of watches in 5 hours, james can inspect the same case in 3 hours. after working alone for 1 hour, carrie takes a break. after taking a 40 minute break, c

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Question 469047: carrie can inpsect a case of watches in 5 hours, james can inspect the same case in 3 hours. after working alone for 1 hour, carrie takes a break. after taking a 40 minute break, carrie and james work together to inspect the remaining watches. how long do carrie and james work together to complete the job?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
1/5+n/5+n/3=1
n/5+n/3=4/5
3n+5n=12
8n=12
n=12/8=1.5 hours for them to finish together..