1. The problem statement, all variables and given/known data A jetliner has a cruising air speed of 620mph relative to the air. Part B How long does it take this plane to fly round-trip from San Francisco to Chicago, an east–west flight of 2000 miles each way, if the wind is blowing at 120mph from the west to the east? 2. Relevant equations 3. The attempt at a solution I've tried 8 hours. and 7.225 hours.