<PRE><B>Question 809337</B>
s = d / t
k = 312/T
d = 270/T
k = d + 7
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k = d + 7
312/T = 270/T + 7
312 = 270 + 7T
7T = 42
T = 6 hours
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Answer:
k = 52 mph
d = 45 mph
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