to a painter can finish painting a house in 8 hours. Her assistant takes 10 hours to finish the same job. How long would it take for them to complete the job if they were working together? a. 9/40 hours b. 7 hours c. 9 hours d. 4 4/9 hours

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9/40 of the house is done in one hour; how many hours to finish the house?

4 hours is 36/40; just got 4/40 left = 1/10 of an hour

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