flying against the jetstream, a jet travels 3400 mi in 5 hours. The same jet travels 9720 mi in 9 hours. What is the

Question

Rate of the jet in still air

 

Rate of the jetsream

Answer 1

R is the speed of the jet

S is the speed of the stream

 

 

Against the stream:

  3400 = 5*(R-S)

 680 = R-s

 

With the stream:

  9720 = (R+S)*9

  1080 = R+S

 

1760 = 2R

R = 880

S = 200