Rick's spaceship flies through air at 900 mph if there's no wind. On a trip through the atmosphere from Seattle to Washington DC and back again, he has to deal with the jet stream. He can travel 206 miles there in the same amount of time as it takes to go 154 miles on the way back. How fast is the jet stream?
(treat the spaceship like a boat, it's speed like a boat's speed, and the jet stream is like a current...)
Make sure your answer makes sense, and that Rick can overcome the speed of the jet stream. (4 points)