Question 1043838
I'm assuming the plane's speed x allows it to travel 440 miles with the wind and in the same time 330 miles against the wind.
(x+21)t=440, t=440/(x+21); rate x time =distance. time=distance/rate
(x-21)t=330, t=330/(x-21)
Set the two values equal to each other.
440/(x+21)=330/(x-21)
cross multiply
440x-9240=330x+6930
110x=16170
x=147 mph ANSWER
with the wind, 168 mph and 440/168=2.619 hours
against the wind, 126 mph and 330/126=2.619 hours, checks.