<PRE><B>Question 930186</B>
x = wind speed
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s = d/t
t = d/s
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with the wind:
t = 3850/(525 + x)
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against the wind:
t = 3500/(525 - x)
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equate the times:
3850/(525 + x) = 3500/(525 - x)
3850(525 - x) = 3500(525 + x)
3850*525 - 3850x = 3500*525 + 3500x
3500x + 3850x = 3850*525 - 3500*525
(3500 + 3850)x = 3850*525 - 3500*525
x = ( 3850*525 - 3500*525 ) / (3500 + 3850)
x = 25
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answer:
x = wind speed = 25 mph
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