Question 371399
Rate*Time=DIstance
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Let the plane speed be {{{P}}} and the wind speed by {{{W}}}.
With the wind,
{{{(P+W)2=480}}}
1.{{{P+W=240}}}
Against the wind,
{{{(P-W)3=480}}}
2.{{{P-W=160}}}
Add eq. 1 and eq. 2,
{{{P+W+P-W=240+160}}}
{{{2P=400}}}
{{{highlight(P=200)}}}mph
Then from eq. 1,
{{{200+W=240}}}
{{{highlight(W=40)}}}mph