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Question 816555: austin and george can wash a car in 35 minutes. austin can wash the same car in 40 minutes without any help. how long would it take george to wash the car on his own?
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! a + g = 1 car / 35 min
a = 1 car / 40 min
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a + g = 1/35
a = 1/40
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a + g = 1/35
1/40 + g = 1/35
g = 1/35 - 1/40
g = 40/1400 - 35/1400
g = 5/1400
g = 1/280
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rate = unit/time
time = unit/rate
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answer:
george needs 280 minutes to wash the car on his own
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