6th Grade Working/Engineering Problems: Problem 1

Problem: Mr. Smith and Mr. Johnson are working together to build a small treehouse. Working together, they can finish the treehouse in 6 days. If Mr. Smith worked on it for 5 days alone, then Mr. Johnson taking over for 3 more days, they would complete 7/10 of the entire treehouse. If they each worked on the treehouse by themselves, how long will it take each of them to complete the treehouse?

Key: Set the '1 whole' value

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