SOLUTION: A new plane cruises at a speed of 400 m.p.h. If it makes a trip in 7 hours with a strong wind and the return trip against the same wind in 9 hours, how fast was the wind?

Question 1104571: A new plane cruises at a speed of 400 m.p.h. If it makes a trip in 7
hours with a strong wind and the return trip against the same wind in 9
hours, how fast was the wind?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
speed=400
wind=w
(400+w)7=7w+2800
(400-w)9=-9w+3600
those are equal, since they are the same distance
so 7w+2800=-9w+3600
16w=800
w=50 mph
450 mph with the wind*7 hours is 3150 miles
350 mph against the wind*9 hours is 3150 miles
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