Question 988303
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W=speed of wind
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{{{210mi/(355mph+W)=145mi/(355mph-W)}}} Cross multiply.
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{{{210mi(355mph-W)=145mi(355mph+W)}}}
{{{74550mi^2/hr-210miW=51475mi^2/hr+145miW}}} Subtract 51475mi^2/hr from each side.
{{{23075mi^2/hr=355miW}}} Divide each side by 355mi.
{{{65mi/hr=W}}}
ANSWER: The wind speed was 65 mph.