Jenn does 1/11.5 = 1/23 of the job in an hour. Kathy does 1/7 of the job in a hour. Together they do 7/161 + 23/161 = 30/161 of the job in an hour. Which means they will take 161/30 = 5.37 hours to do the whole job together.
Isabella B.
asked • 06/07/20Jenn fan rake the yard in 11.5 hours. kathy can do the raking job in 7 hours. How long will it both girls working together?
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Housney A.
1 / 11.5 = 2 / 23 , not 1 / 2306/08/20