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Carrie can inspect a case of watches in 5 hours. James can inspect the same case of watches in 3 hours. After working alone for 1 hour, Carries stops for lunch. After taking a 40 minute lunch break, Carrie and James work together to inspect the remaining watches. How long do Carrie and James work together to complete the job?

1 answer

Carrie = 1 case / 5 hours = .2 case/hr
James = 1 case/3 hours = .333 case/hr

together they do .533 case/hr

so
.2 * 1 hr + .533 * x hr = 1 case

.533 x = .8

x = 1.5 hours more
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