Question 815336: It is 2800 miles from new York to London.it takes 7 hours to get to London with the wind and 9 hours on a return trip against the wind. What is the rate of the wind
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! s = d / t
t = d / s
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2800/(a + w) = 7
2800 = 7(a + w)
2800 = 7a + 7w
7a = 2800 - 7w
a = 400 - w
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2800/(a - w) = 9
2800 = 9(a - w)
2800 = 9a - 9w
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2800 = 9a - 9w
2800 = 9(400 - w) - 9w
2800 = 3600 - 9w - 9w
18w = 800
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wind speed = 44.444444 mph
airplane speed = 355.555555 mph
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