Offering 25 pts and a mark for real answers ! flying against the jetstream, a jet travels
5600 miles in 8 hours. flying with the jetstream, the same jet travels
4000 miles in 4 hours. what is the rate of the jet in still air and what is the rate of the jetstream?

Step-by-step explanation:

The speed of the plane is the average of the two speeds. The speed of the jet stream is half their difference.

against: (5600 mi)/(8 h) = 700 mi/h

with: (4000 mi)/(4 h) = 1000 mi/h

Plane's speed = (700 + 1000)/2 mi/h = 850 mi/h

jetstream speed = (1000 -700)/2 mi/h = 150 mi/h

The rate of the jet in still air is 850 mi/h; the rate of the jetstream is 150 mi/h.

answer by yourhope:

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