a twinengined air craft can fly 1200 miles from city a to ci

a twin-engined air craft can fly 1200 miles from city a to city b in 5 hours with the wind and make the return trip in 8 hours against the wind. What is the speed of the wind?

1,200/5=240 mph with thwe wind.
1,200/8=150 mph against the wind.
(240-150)/2=90/2=45 mph is the wind speed.
Proof:
240-45=195 speed of the plane in still air.
150+45=195 ditto.