<PRE><B>Question 812261</B>
s = d / t
d = s * t
w = 10
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out: d = (s - w)2.5 = (s - 10)2.5 = 2.5s - 25
bck: d = (s + w)1.5 = (s + 10)1.5 = 1.5s + 15
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2.5s - 25 = 1.5s + 15
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s = 40 mph
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