Question 322270
Let V be the plane speed, W the wind speed.
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Rate*Time=Distance
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{{{(V+W)3=3000}}}
1.{{{V+W=1000}}}
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{{{(V-W)4=3000}}}
2.{{{V-W=750}}}
Add eq. 1 and eq. 2,
{{{V+W+V-W=1000+750}}}
{{{2V=1750}}}
{{{highlight(V=875)}}} kph
Then use either equation to solve for W.
{{{875+W=1000}}}
{{{highlight(W=125)}}} kph