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a supervisor can complete 18 jobs in 3 minutes
a worker can complete 24 jobs in 6 minutes
the worker began to work for 2 minutes and then the supervisor joins in to help
how long would it take them together to finish a total of 88 jobs?
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The supervisor can complete 18 jobs in 3 minutes or 36 jobs in 6 minutes. So with the worker (24jobs / 6 minutes) they can complete 60 jobs in 6 minutes. Or 10 jobs per minute.
In the 2 minutes the worker worked by himself, he can complete 8 jobs. That leaves 80 jobs left to complete together. At a rate of 10 jobs/minute, they would need to work 8 minutes together.
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