Initial table of data before analyzing the time quantities; w is tailwind speed.
SPEED TIME DISTANCE
WITHWIND 155+w 950
AGAINSTWD 155-w 950
SPEED TIME DISTANCE
WITHWIND 155+w 950/(155+w) 950
AGAINSTWD 155-w 950/(155-w) 950
Concentrate on the part of the description, Flying against a headwind, it takes
3 hours longer to complete the return trip.
This means .
The rest is arithmetic to solve the equation for , the speed of the wind.
......using you will get: