# SOLUTION: Jack usually mows his lawn in 3 hours. Marilyn can mow the same lawn in 5 hours. How much time would it take for them to mow the lawn together?

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 Click here to see ALL problems on Quadratic Equations Question 271639: Jack usually mows his lawn in 3 hours. Marilyn can mow the same lawn in 5 hours. How much time would it take for them to mow the lawn together?Answer by mananth(13127)   (Show Source): You can put this solution on YOUR website!Jack usually mows his lawn in 3 hours. Marilyn can mow the same lawn in 5 hours. How much time would it take for them to mow the lawn together? JAck mows the lawn in 3 hours. he does 1/3 of the job in 1 hour Marilyn takes 5 hours . So she does 1/5th. job in 1 hour. they together do 1/3 + 1/5 of the job in 1 hour. = 8/15 of the job . 8/15 of the job they take 1 hour so 1 job they take 15/8 hours = 1.88 hours