<PRE><B>Question 814315</B>
p = 180
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s = d / t
d = s * t
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d = (p - w) * 3
d = (p + w) * 2.8
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3(p - w) = 2.8(p + w)
3(180 - w) = 2.8(180 + w)
540 - 3w = 504 + 2.8w
36 = 5.8w
w = 6.2068966
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Answer:
w = 6.2 mph
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