SOLUTION: A certain aircraft can fly 630 miles with the wind in 3 hours and travel the same distance against the wind in 7 hours. What is the speed of the wind?

Question 732448: A certain aircraft can fly 630 miles with the wind in 3 hours and travel the same distance against the wind in 7 hours. What is the speed of the wind?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
630 miles in 3 hours
with wind speed = 210 mph
630 in 7 hours
against wind speed = 630/7 = 90 mph
plane speed = x
wind speed = y
x+y = 210
x-y=90
add up the equations
2x=300
/2
x= 150 mph
so wind speed = 60 mph
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