Question 353518
Let P = speed of the plane, and W = speed of the wind.
Using the formula {{{d = r*t}}}, or distance  = speed x time, we get 
{{{2*(P + W) = 460}}}, and {{{2*(P - W) = 340}}}.
These are the same as {{{P+ W = 230}}} and {{{P - W = 170}}}.
Adding corresponding sides, we get {{{2P = 400}}}, or {{{P = 200}}}.
Thus the speed of the wind is {{{W = 230 - 200 = 30}}} miles per hour.