<PRE><B>Question 820508</B>
s = d / t
d = s * t
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D = (s + 3)4 = (s - 3)10
4s + 12 = 10s - 30
6s = 42
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s = 7 mph
2D = 2( 4(7) + 12 )
2D = 80
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answer:
round trip distance: 80 miles
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