SOLUTION: I can weed the garden in 90 min. MY friend needs 20 min more. How long will it take us to do the job together

Question 621039: I can weed the garden in 90 min. MY friend needs 20 min more. How long will it take us to do the job together
Found 2 solutions by jim_thompson5910, matt501823:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
1/90 + 1/110 = 1/t

110t + 90t = 90*110

110t + 90t = 9900

200t = 9900

t = 9900/200

t = 49.5

So it will take 49.5 minutes (or 49 minutes 30 seconds) if you work together.
Answer by matt501823(7) (Show Source): You can put this solution on YOUR website!
If you weed the garden in 90 minutes it means that you weed of a garden per hour. If you friend takes 20 more minutes that means that he takes 110 minutes or that he weeds of a garden per hour. If you find a common denominator between and you get and . If you add 66 and 54 together you get . Thus you complete of the weeding in 1 garden over the course of 1 hour. can be simplified to which amounts to the non-terminating decimal of 1.111. If you were to divide 1 hour (60 minutes) by 1.111 you would get (in minutes). This means that it would take approximately 54 minutes for you and your friend to finish weeding 1 garden.
RELATED QUESTIONS
Joan can weed the garden in 40 min and her mother can weed the garden in 60 min. How long (answered by jorel1380)
Joan can weed the garden in 40 min and her mother can weed it in 60 min. How long would... (answered by jorel1380)
Joan can weed the garden in 40 min and her mother can weed it in 60 min. How long would... (answered by deborabr)
Joan can weed the garden in 40 min and her mother can weed it in 60 min. How long would... (answered by josmiceli)
Joan can weed the garden in 40 min and her mother can weed it in 60 min. How long would... (answered by jorel1380)
Tina can weed her vegetable garden completely in 90 minutes. Her friend Marisa can do... (answered by josgarithmetic)
Tina can weed her vegetable garden completely in 20 minutes. Her friend Marisa can do the (answered by jorel1380,josmiceli,MathTherapy)
Myra can weed a garden in 3hrs. Ana can do it in 4hrs. How long will it take them to... (answered by oscargut,Emsley)
Joan can weed the garden in 40 min and her mother can weed it in 60 min. How long would... (answered by jorel1380)