Question 134622
Let s be the speed during the first 40 minutes, then 2s is the speed for the last 80 minutes.

{{{Distance = w*(40/60) + 2w*(80/60)}}}
{{{160 = 2w/3 + 8w/3}}}
{{{480 = 2w + 8w}}}
{{{480 = 10w}}}
{{{48 = w}}}
How far did the plane go in the first 40 minutes?
Distance = rate*time = 48 * 2/3 = 32 miles.

The plane went 96*4/3 after the wind changed = 128 miles
For a total of 32+128 = 160 miles.

That wind really helped:)