Mathematics, 02.10.2019 16:30, foriegnngal

Jeff and kirk can build a 75-ft retaining wall together in 6 hours. because jeff has more experience, he could build the wall by himself 3 hours quicker than kirk. how long would it take kirk (to the nearest minute) to build the wall by himself?

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Jeff and kirk can build a 75-ft retaining wall together in 6 hours. because jeff has more experience...