When flying from A to B the aircraft experiences a
headwind component of 60kt
Our TAS is 380kt so our actual ground speed will be
320kt
So the distance from A to B is 480NM at 320kt this
will take 90 minutes.
Since we experienced a headwind from A to B I will
assume we will experience a tail wind from B - A (it would be nice if the
question confirmed this )
Once again our TAS will be 380kt and if we include the
tail wind (60kt) our ground speed will be 440kt from B to A.
The distance remains 480NM and at a ground speed of
420kt this will take 65 minutes.
65 minutes + 90 minutes = 2 Hours and 35 minutes