Long time reader, first time poster
"An airliner traveling from Toronto to Vancouver took 5hrs to cover the 3900k trip against a headwind. The return trip, traveling with a tailwind that was twice the speed of the headwind took 4hours and 20 mins.
Hint: You will need to use the formula, distance = speed x time.
a) How fast were the headwind and the tailwind on the two trips
b) How fast would the airliner have flown in still air?)