<PRE><B>Question 808798</B>
630 / 2 = 315 miles
s = d / t
s1 = p + w = 315 / 7 = 45 mph
s2 = p - w = 315 / 20 = 15.75 mph
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p + w = 45
p = 15.75 + w
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(15.75 + w) + w = 45
15.75 + 2w = 45
2w = 29.25
w = 14.625 mph
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Answer:
wind: 14.625 mph
plane: 30.375 mph
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