Sarah’s mom took 3 hours to clean, but when Sarah helped, it took them 2 hours to clean. How many hours will it take Sarah to clean herself?

Question

hongcuc2 · Answer

Answer:     It takes them 1.875 hours.            Step-by-step explanation:            Here, the job is cleaning the house.            Mom does 1 job in 3 hours.            In 1 hour, mom does 1/3 of the job.            Dad does 1 job in 5 hours.            In 1 hour, dad does 1/5 of the job.            Mom and dad working together do the job in x hours.            In 1 hour, mom and dad together do 1/x of the job.            1/3 + 1/5 = 1/x            5/15 + 3/15 = 1/x            8/15 = 1/x            8x = 15            x = 15/8 = 1.875            Answer: It takes them 1.875 hours.     your welcome

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