SOLUTION: Janet can wax her car in 8 hours. When she works together with Darlene, they can wax the car in 30 minutes. How long would it take Darlene, working by herself, to wax the car?
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Matrices-and-determiminant
-> SOLUTION: Janet can wax her car in 8 hours. When she works together with Darlene, they can wax the car in 30 minutes. How long would it take Darlene, working by herself, to wax the car?
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Question 111585: Janet can wax her car in 8 hours. When she works together with Darlene, they can wax the car in 30 minutes. How long would it take Darlene, working by herself, to wax the car?
Is it the same as this: If J=8 and D+J= 1/2 D is equal to what? I know the answer 8/15 hours i dont know how it is got
I dont know what topic is it?
Thank You very much Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! (janet's rate) + (Darlene's rate = (1 car / 1/2 hour)
(1 car / 8 hrs) + (1 car / D hours) = (2 cars / 1 hour)
multiply both sides by 8D hr
or hr
So, Darlene can wax the car in 32 min by herself
