Question 176004
D=RT
2920=R*4
R=2920/4
R=730 KMH AGAINST THE JETSTREAM.
7630=5*7
R=7630/7
R=1090 KMH QITH THE JETSTREAM.
(1090-730)/2=360/2=180 KMH IS THE SPEED OF THE JETSTREAM.
Proof:
730+180=910 speed of the jet in still air
1090-180=910 ditto.