SOLUTION: Josh can deliver his newspapers in 30 minutes. If Amber helps him, it takes 12 minutes working together. How long would it take amber working by herself? I think that the minutes h
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Question 260617: Josh can deliver his newspapers in 30 minutes. If Amber helps him, it takes 12 minutes working together. How long would it take amber working by herself? I think that the minutes have to be put into a fraction of the number over 60 but i am not sure.. Answer by nerdybill(7384) (Show Source):
You can put this solution on YOUR website! Josh can deliver his newspapers in 30 minutes. If Amber helps him, it takes 12 minutes working together. How long would it take amber working by herself?
.
Let x = minutes it takes Amber to deliver by herself
then
12(1/30 + 1/x) = 1
Multiply both sides by 30x:
12(x + 30) = 30x
12x + 360 = 30x
360 = 18x
360/18 = x
20 minutes = x
