Question 317587
Rate*Time=Distance
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Let V be the speed of the plane in still air.
Let W be the wind speed. 
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{{{(V+W)3=2667}}}
1.{{{V+W=889}}}
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{{{(V-W)3=2277}}}
2.{{{V-W=759}}}
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Add eq. 1 and eq. 2,
{{{V+W+V-W=889+759}}}
{{{2V=1648}}}
{{{highlight(V=824)}}} kph
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{{{824+W=889}}}
{{{highlight(W=65)}}} kph