SOLUTION: Ann and Mary mow lawns together. When Ann mows the lawn for Mr. Smith, it takes 100 minutes. When Mary and Ann mow the lawn for Mr. Smith together, they get the job done in 40 minu

Question 921039: Ann and Mary mow lawns together. When Ann mows the lawn for Mr. Smith, it takes 100 minutes. When Mary and Ann mow the lawn for Mr. Smith together, they get the job done in 40 minutes. How long will it take Mary to mow the lawn for Mr. Smith alone?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
|Multiplying thru by 200x so as all denominators = 1
2m + 200 = 5m
200 = 3m
66 2/3 min = m, time it will take for Mary to mow the lawn alone

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