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?
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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