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Jack estimates that with the trainee helping him paint the house, he can complete the job in 18 hours.

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Q: Jack accepted a job to paint a new house he calculated that he can complete the job in 30 hours he hired a trainee to assist him he has seen the trainee work and estimates that the trainee working?
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Related questions

Juan accepted a job to roof a new house He can complete the job in 20 hours His trainee takes 25 hours to complete the job How much time should the two of them working together need to roof the house?

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