A small airplane traveling east, with the jet stream, can cover 525 miles in 3 hours. Going west, it takes the plane 7 hours to go the same distance.|||Speed of the wind (y) in terms of speed of the plane (x):
3(x + y) = 7(x - y)
3x + 3y = 7x - 7y
4x = 10y
2x = 5y
y = 2/5x
Speed of plane (x):
3(x + 2/5x) = 525
1 2/5x = 175
7/5x = 175
x = 125
Answer: 125 mph is the speed of plane.
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